User KJ7LNW

8 votes

2 answers

489 views

Why would you use a shared-gate multi-channel MOSFET device?

mosfet fet

asked Aug 28, 2020 at 19:32

7 votes

2 answers

5k views

What is Negative Inductance?

asked Jul 14, 2020 at 19:26

4 votes

2 answers

550 views

Some LDO's specify noise in nV/Hz, others specify it in μV(rms). How do they equate?

voltage-regulator noise ldo low-noise-amplifier

asked May 19, 2021 at 1:44

3 votes

2 answers

546 views

How do you match an LDMOS FET to 50 Ohms?

datasheet mosfet-driver impedance-matching input-impedance power-amplifier

asked Aug 7, 2020 at 1:33

3 votes

2 answers

142 views

Can VSWR be complex-valued or is it always real?

rf impedance impedance-matching reflection reflection-coefficient

asked Mar 15 at 2:35

2 votes

1 answer

52 views

Which matrix index should be used when Y (admittance) is shown to compose a circuit segment mapped to an ABCD matrix? Y21? Other?

circuit-analysis rf impedance passive-networks s-parameters

asked May 29 at 1:25

2 votes

1 answer

84 views

Can you identify this digital signal? It looks like a UART signal and can't figure out the baud rate

uart serial digital-communications rs232 digital-modulation

asked Jun 10 at 7:29

2 votes

1 answer

1k views

What is the difference between "Operating Voltage" and "Drain-Source Voltage" for an LDMOS FET?

transistors mosfet amplifier fet power-amplifier

asked Aug 20, 2020 at 22:21

2 votes

1 answer

316 views

Please Identify this adjustable inductor (ferrite-core bobbin)

rf transformer inductor ferrite

asked Aug 31, 2020 at 23:33

2 votes

0 answers

198 views

How do you calculate phase shift induced by a shunt capacitor?

diodes phase-shift reactance reflection varactor

asked Jul 23, 2020 at 5:54

2 votes

1 answer

144 views

L-C-L vs Pi network

rf filter phase-shift ham-radio

asked Jun 26, 2020 at 0:54

2 votes

2 answers

328 views

Band-pass filter vs. Serial Low-pass+High-pass filter - Is there a difference?

rf filter low-pass high-pass-filter band-pass

asked Jul 9, 2020 at 0:55

2 votes

0 answers

150 views

How would you design a power divider with 50-Ohm unbalanced input and 4x 100-Ohm balanced output impedances to send RF down a CAT6 cable?

power rf filter impedance passive-networks

asked Jul 22, 2021 at 0:44

2 votes

1 answer

230 views

In practice, does the order of a series RLC-shunt circuit matter?

rf filter impedance series impedance-matching

asked Mar 14, 2021 at 22:33

2 votes

2 answers

327 views

How do you choose a PWM Frequency to drive a DC motor? [duplicate]

pwm dc-motor frequency duty-cycle

asked Mar 24, 2021 at 20:31

1 vote

2 answers

168 views

How does a Touchstone (s2p) file indicate whether it should pass or block DC?

capacitor amplifier inductor simulation impedance

asked Mar 18, 2021 at 21:43

1 vote

2 answers

92 views

Can an antenna be modeled as a 2-port passive network?

rf antenna simulation passive-networks ham-radio

asked Oct 8, 2021 at 4:12

1 vote

2 answers

785 views

Why is the Irms so different from Isat in different power inductors?

power-supply dc-dc-converter inductor boost buck-boost

asked Mar 24, 2021 at 1:15

1 vote

1 answer

76 views

What high-power anti-reflection mechanisms exist to protect amplifiers when an the antenna is disconnected?

power amplifier rf heat

asked Jun 3, 2021 at 3:30

1 vote

1 answer

141 views

Choosing an SMT capacitor size (and voltage) for high-power RF coupling at 300W

power capacitor rf surface-mount heat

asked Jun 2, 2021 at 0:30

1 vote

1 answer

71 views

Can anyone identify this 40-pin SMT socket on the Silicon Labs BRD4180A board?

identification socket

asked Jan 22, 2021 at 2:19

1 vote

3 answers

84 views

Do parallel LNAs at 90-degrees to eachother reduce the noise floor more than side-by-side?

amplifier signal-integrity signal-to-noise low-noise-amplifier noisefloor

asked Jul 25, 2020 at 7:37

1 vote

3 answers

265 views

How would you combine DC power, bi-directional serial data, and an RF signal on a single 50-Ohm coax feedline?

rf dc serial serial-bus ham-radio

asked Aug 1, 2020 at 22:47

1 vote

1 answer

95 views

What is the R-C Feedback to this FET?

mosfet amplifier rf feedback powermosfet

asked Sep 1, 2020 at 2:08

1 vote

1 answer

24 views

How do I EM-Extract a subcircuit and define a different em/drawing-layer than the original circuit in AWR?

simulation software microstrip eda em

asked Sep 9, 2020 at 22:49

1 vote

1 answer

174 views

How can I tell whether an SMT/SMD Capacitor is oriented with plates horizontal or vertical?

capacitor surface-mount layout ceramic mlcc

asked Nov 12, 2020 at 3:02

1 vote

1 answer

37 views

What would be the S-parameters for an "ideal" shorted transmission line?

rf transfer-function transmission-line s-parameters

asked Jul 8 at 1:32

1 vote

0 answers

38 views

How do you "calibrate" (?) a matching network to re-optimize an S11 match based on physical measurements from a VNA?

rf filter impedance measurement impedance-matching

asked Aug 3 at 21:12

1 vote

1 answer

61 views

Can you measure or estimate antenna reflection back into freespace caused by a freespace impedance mismatch?

rf antenna simulation passive-networks ham-radio

asked Oct 8, 2021 at 21:27

1 vote

1 answer

48 views

Can admittance (Y) be used to calculate reactance when L and C values are calculated from the Y12 and Y11 parameters like normal as X=XL-XC?

rf filter impedance impedance-matching reactance

asked May 23 at 0:17

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65 Questions

Why would you use a shared-gate multi-channel MOSFET device?

What is Negative Inductance?

Some LDO's specify noise in nV/Hz, others specify it in μV(rms). How do they equate?

How do you match an LDMOS FET to 50 Ohms?

Can VSWR be complex-valued or is it always real?

Which matrix index should be used when Y (admittance) is shown to compose a circuit segment mapped to an ABCD matrix? Y21? Other?

Can you identify this digital signal? It looks like a UART signal and can't figure out the baud rate

What is the difference between "Operating Voltage" and "Drain-Source Voltage" for an LDMOS FET?

Please Identify this adjustable inductor (ferrite-core bobbin)

How do you calculate phase shift induced by a shunt capacitor?

L-C-L vs Pi network

Band-pass filter vs. Serial Low-pass+High-pass filter - Is there a difference?

How would you design a power divider with 50-Ohm unbalanced input and 4x 100-Ohm balanced output impedances to send RF down a CAT6 cable?

In practice, does the order of a series RLC-shunt circuit matter?

How do you choose a PWM Frequency to drive a DC motor? [duplicate]

How does a Touchstone (s2p) file indicate whether it should pass or block DC?

Can an antenna be modeled as a 2-port passive network?

Why is the Irms so different from Isat in different power inductors?

What high-power anti-reflection mechanisms exist to protect amplifiers when an the antenna is disconnected?

Choosing an SMT capacitor size (and voltage) for high-power RF coupling at 300W

Can anyone identify this 40-pin SMT socket on the Silicon Labs BRD4180A board?

Do parallel LNAs at 90-degrees to eachother reduce the noise floor more than side-by-side?

How would you combine DC power, bi-directional serial data, and an RF signal on a single 50-Ohm coax feedline?

What is the R-C Feedback to this FET?

How do I EM-Extract a subcircuit and define a different em/drawing-layer than the original circuit in AWR?

How can I tell whether an SMT/SMD Capacitor is oriented with plates horizontal or vertical?

What would be the S-parameters for an "ideal" shorted transmission line?

How do you "calibrate" (?) a matching network to re-optimize an S11 match based on physical measurements from a VNA?

Can you measure or estimate antenna reflection back into freespace caused by a freespace impedance mismatch?

Can admittance (Y) be used to calculate reactance when L and C values are calculated from the Y12 and Y11 parameters like normal as X=XL-XC?