I'm planning to make a handheld LCR meter (plus more) based on Cypress's PSoC 5LP chips. One of their many features is a built in boost converter, which seems an attractive prospect, since it would allow me to efficiently power the device from two AA cells, instead of inefficiently with a linear regulator on a 9V battery. The boost regulator supports up to 50mA of current going from 3V to 5V, with a 10uH external inductor. The regulator uses a 400kHz switching frequency.
However, the nature of the device is that it does sensitive analog measurements. In ESR mode, for instance, it generates a waveform at around 100mV, and has to accurately measure the attenuation. When measuring inductance or capacitance, it likewise has to generate and accurately measure waveforms, at frequencies from a few kilohertz up to about 1MHz.
Will I see significant coupling of noise from the boost converter into the analog signals I'm measuring? What steps can I take to prevent it - and is it practical to eliminate the noise to an acceptable degree in a handheld application with a reasonable cost constraint?