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Questions tagged [high-frequency]

This tag marks questions related high frequency (radio) circuits.

0
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1answer
30 views

Measure the frequency response of a current probe

I need to measure the frequency response of a current probe, whose frequency range goes from 120 Hz to 60 MHz. I know that I have to use a signal generator, the probe and an oscilloscope. But how do ...
24
votes
7answers
5k views

Why is 50 Ω often chosen as the input impedance of antennas, whereas the free space impedance is 377 Ω?

In order to efficiently deliver power to a different part of a circuit without reflection, the impedances of all circuit elements need to be matched. Free space can be regarded as a further element, ...
45
votes
13answers
9k views

Why do fundamental circuit laws break down at high frequency AC?

We're just starting the whole RF scene having dealt with DC and low frequency AC for all our previous courses. I understand that at high frequency AC, fundamental circuit laws don't apply anymore ...
-3
votes
2answers
147 views

Is there any way to convert 50 Hz directly to 1 MHz? [closed]

I want to know whether there are any ways to convert 50 Hz AC to 1 MHz without Voltage Controlled Oscillators? If I'm correct, all the normal circuits convert the AC to DC and then use it to ...
1
vote
3answers
337 views

Is it possible to measure frequency upto 500Mhz with 50Mhz oscilloscope?

Is there a way to measure higher frequency measurements with a 50 MHz oscilloscope (eg rigol ds1054z)? Perhaps some post processing of captured waveforms? Or with the help of some adapters? I have a ...
0
votes
2answers
68 views

Design a tank circuit for class C power amplifier using ADS

I am trying to figure out the best values for the tank circuit values (L and C) in order to compare the amplifier's efficiency with the output power I have chosen the tank value L1 and C7 to resonate ...
0
votes
1answer
50 views

Impedance Matching Network with tracks+connectors in between (practice)

I've been struggling on how to design (and develop in practice) an impedance matching network with some traces/tracks/paths (whatever you wanna call it) and some connectors in between. So here is the ...
1
vote
0answers
80 views

Resonant, autotuned nanopulser

My need is to build (or purchase, if existent) a nanopulser, but not an ordinary one: it has to have some specific characteristics. The premise is: I have a device which acts as a variable capacitor ...
0
votes
2answers
52 views

High current/high voltage/high frequency measurement

I have a circuit that I'm having trouble understanding. It measures the current flowing through a conductor. The measured load is 20-100 Amps, 9kHz-34kHz, and approx. 340 volts. The main conductor ...
2
votes
2answers
136 views

How to amplify a low Amplitude, High frequency signal from Ultrasonic Transducer?

I am working with some ultrasonic transducers, the receiver gets a signal of around 10 mVp-p at 125 kHz and for its purpose needs a gain of around 10. So far have a simple inverting OP-Amp setup, ...
0
votes
1answer
66 views

EHF RF Transmitter and Receiver

We are working on a blood glucose meter that will measure BG readings through radio waves with a frequency between 60-70 GHz. That range is necessary to allow penetration through the tissue and we ...
0
votes
1answer
50 views

Asynchronous SRAM routing crosstalk concerns

I'm routing a large BGA SRAM that is connected to a BGA FPGA, and there's about 40 signals altogether connecting the two. I'm using Henry Ott's recommended 8-layer stackup: 1 ________________Mounting ...
1
vote
1answer
67 views

High voltage high speed low current amplifier

I want to design an amplifier that can take an 8MHz signal (even square) with an amplitude of only a few volts (1-3V) and amplify it up to 160V but I only need it to deliver about 60mA. I also want to ...
5
votes
4answers
2k views

Is there a small (6-pin) DIP I can use to generate multi-MHz squarewave clocks with an external crystal?

I'm building a circuit that I'd like to run at 8 MHz to begin with, but I want to be able to try it out at 10, 12, 16, 20, and, maybe, 25 MHz. I know that many microcontrollers have the ability to ...
5
votes
1answer
255 views

Build a High-Voltage High-Frequency Power Supply

I need to build a HV HF power supply to ionize gas. The specifications are 12V input voltage and 10kV output voltage @ 13.56MHz. I know this is not an easy task at all, since in this frequency area, ...
22
votes
3answers
2k views

Why solder mask are not applied to RF PCBs

I've gone through some of the RF PCB designs. In which solder masking on the traces are not present. Like this one Is there a specific reason or performance issue to remove that?
0
votes
0answers
25 views

determine the cutoff frequency of a nMOS in common gate with gate resistance

I have to determine the upper cutoff frequency of this circuit. I absolutely mustn't use the laplace domain because it's too time consuming so not compatible with the time I have at the exam. A rapid ...
0
votes
2answers
73 views

Sram circuit design recommendations

I'm trying to design a simple SRAM board (using a cypress Cy7c1011cv33) to connect to my lattice machox3 starter kit's pin connectors. But I have some design questions, after reading their "SRAM Board ...
1
vote
2answers
101 views

High Speed Signal on Large Circular Ring

It's frequently communicated that when working with signals in the Ghz range, routing is extremely important to signal integrity. Pretty much any inclusion of unnecessary stubs is out of the question, ...
0
votes
2answers
64 views

High frequency AM demodulation

I'm building an light communication device(pretty much lifi) using AM and am mostly done with every part except for demodulating the signal. The signal looks like with a 1.8432MHz carrier wave(serial ...
2
votes
2answers
56 views

Radars and high frequency relation

Whenever I seach for radar implementations, independently of application (weather, military, autonomous vehicles, speed limiters, etc) it always comes in many flavours: huge antennas, small antennas, ...
-1
votes
1answer
68 views

Common source amplifier, source degeneration and determining the cutoff frequency

I have a n-MOS transistor with the following biasing network: I have to determine the cutoff frequency due to GS and GD capacitances The method used by my book is to first redefine the ...
0
votes
1answer
63 views

Multi-fixed-station AM receiver

I'm in the pencil-and-paper stage of building a radio receiver that has the following characteristics: AM shortwave/HF three fixed frequencies - 3.33, 7.85 and 14.67 MHz single upper sideband with ...
0
votes
1answer
38 views

Problem with calculating high frequency response of a CE amp

I have this amp: The parameters of the transistor are hfe=120, Cje=40pF and Cjc=4pF. I am also told to assume Cpi = Cje = 40pF and Cmu = Cjc= 4 pF. From that I should calculate fh and compare it ...
0
votes
0answers
603 views

Smallest circuit for Ultrasonic Mist Maker or humidifier

I am working on Ultrasonic Mist Maker or humidifier circuit, but does not found any good circuit. As search on google that we have to make about frequency 1.6MHz to convert water into mist. using ...
4
votes
1answer
375 views

How come esp8266 is able to generate 2.4 GHz wifi signals

I am wondering how it is possible to generate 2.4 GHz, if its core clock frequency is much lower than GHz scale.
0
votes
0answers
25 views

NMOS varactor Simulation Help?

I am trying to simulate a pair of NMOS transistors as varactors (BSD connected). However, am not getting any resonance at the particular frequency of interest. When I am simulating it, it is giving a ...
-1
votes
1answer
45 views

Are there any examples on the use of the frequency spectrum between 40 and 42 GHz? [closed]

Since everyone started talking about 5G, I got curious about some parts of the frequency spectrum. I found out that some operators in the U.S. asked FCC if they could free the range between 40 and 42 ...
2
votes
1answer
80 views

Addition of HF Capacitor to Constant Current Source

The part of a circuit shown below was used in one of commercially sold audio amplifiers (constant current source shown here was added to differential amplifier, whereas voltage amplification stage ...
-2
votes
1answer
55 views

RF Antenna design guidelines, PCB design Antenna [closed]

What are the parameters to be taken care to RF Antenna designs and RF circuits designs? What are the design criteria for RF designs?
-1
votes
1answer
156 views

What would be the maximum frequency that can be achieved with an LC Oscillator? [closed]

What would be the maximum frequency that can be achieved with an Oscillator that is based only on Capacitors and Inductors ? Could it even reach high frequencies like Gigahertz or even Teraherz or are ...
3
votes
1answer
241 views

High voltage (2-6 kV), high frequency (20-50 kHz) power supply how to achive

I need to make a high voltage (2-6 kV), high frequency (20-50 kHz) power supply in order to generate cold plasma (in Ar gas). I use a fly back circuit (found in web) could allow me to to that. The ...
0
votes
0answers
35 views

Are there UHF RFID antennas with entirely different azimuth and elevation?

To improve UHF RFID reader's accuracy, I want antenna that has long, narrow reading field. So it needs to be directional and have vastly different azimuth and elevation. I stumbled upon few articles, ...
1
vote
2answers
86 views

Availability of 0.01 pF and 1 pF chip capacitor with SRF more than 15 GHz

I am working on a parasitic steerable phased array antenna, designed at 15 GHz. I need to terminate one of the array elements with a 0.01 pF chip capacitor to achieve desired steering direction. I ...
1
vote
1answer
464 views

high frequency transformer basics [closed]

What is the working principle of high frequency transformer?? Does it steps voltage or frequency and how it is different from ordinary transformers found in market? P.S. I could not find proper ...
0
votes
3answers
163 views

Confusion regarding eddy current losses

I have been taught in my machine's class that eddy current losses are proportional to the square of frequency*flux density, this seemed so fair that I never questioned this. But my machine design book ...
2
votes
4answers
156 views

Fast (high) frequency hopping with off-the-shelf components

I am looking for the easiest solution to synthesize 1.6 - 2.4 GHz (qudrature) in steps of 4 MHz settle within 10-50ns precise timing control when to switch frequency (e.g., at rising edge of an ...
2
votes
1answer
143 views

Switching high voltage with consistent risetime

I'm trying to design an IEC61000-4-4 compliant EFT generator for in-house use, which is based on following schematic: I've been able to determine all values for all components, And I've been able to ...
0
votes
3answers
148 views

High Frequency Rectification

I am trying to monitor an incoming signal and get some properties from it. The signal is a sine wave +-5V at 900Mhz. I am trying to measure the amplitude and the frequency of the signal. I will ...
3
votes
1answer
182 views

SPI clock - slow frequency but fast rise time issue with waveforms

Background on the issue: I currently have an SPI bus between an Atmel ATSAM3X8E and a Spansion FL164K flash memory chip. SPI has always been super reliable for me in past projects, but this design ...
0
votes
1answer
74 views

Frequency response of common source amplifier and Millers theorem

I was asked to draw the frequency response of a CS amplifier. The MOSFET has gate-drain capacitance between the input and output. This means that at high frequency, the output is shorted to input(the ...
0
votes
4answers
307 views

Zero Crossing Detection of ~ 400 kHz Signal with MCU

I want to measure the frequency of a signal using the digital input pins of the NUCLEO-F767ZI. The signal is sinusoidal with an amplitude of 5 V and a frequency ranging from 100 kHz to around 400 kHz. ...
0
votes
2answers
35 views

Filtering received frequency signal

I’m working on a problem where I have to build a speed detector using a hardware circuit with a microcontroller. I will be using a radar motion detector module to do this. I have contacted the ...
0
votes
0answers
100 views

Long digital MEMS microphone PDM line recommendations

I am building a system using multiple PDM MEMS microphones with a high acoustic overload point (>130dB) like Invensense INMP621, Infineon IM69D130 or Knowles SPH0644HM4H-1 (see diagram below). At the ...
1
vote
3answers
352 views

Easiest way to generate quadrature signal on PCB

I have a chip which needs a quadrature LO. Specifications: Frequency range: 1.7 GHz - 2.5 GHz (wider range appreciated) Both I/Q differential (i.e. 4 wires in total) Each wire 1Vpp DC offset of 500mV ...
1
vote
2answers
125 views

I need a power source for my DBD (Dielectric Barrier Discharge) [closed]

I need to make a circuit which gives me ac voltage in the range of 5-20 kV and frequency above 1 khz. The ac voltage which my lab gets is 50 hz 240 v. I need to somehow step up the voltage and ...
0
votes
0answers
56 views

how chirp signal is produced in LoRa

I am comparing the LPWAN technologies but LoRa is unique since it uses Chirp Spread Spectrum[CSS] modulation to cover long range. I have a doubt on the hardware that how to produce chirp signal and ...
0
votes
0answers
86 views

Dual channel vs more Frequency Function generator?

I am a computer engineering student, totally new electronics. So far, I have been more inclined toward the software aspect of CE but now I am planning to change that. So I decided to buy some devices ...
1
vote
1answer
94 views

When high frequency current goes through a superconductor, does it still radiate off like it would with copper?

I've been thinking about the skin effect and that got me thinking... When high frequency current goes through a superconductor, does it still radiate off like it would with copper? Just curious.
0
votes
1answer
126 views

Cyclone V data corruption at high frequency

I'm currently trying to implement a FPGA design using a 325 MHz clock, which writes to the SDRAM Controller of a Cyclone V 5CSEBA6U23I7 (Speed Grade 7). When running my IP Core with 2 MHz everything ...