Question

____, ____ and ____ must be properly matched for effective representation of input signal in quadrature sampling.

(a) Modulators, signal paths, correlator

(b) Signal paths, modulators, zero crossing detector

(c) Low pass filters, zero crossing detector, correlator

(d) Low pass filters, modulators, signal paths

I have been asked this question in an interview.

My enquiry is from ADC Tradeoffs in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio

Answer 1

Correct option is (d) Low pass filters, modulators, signal paths

Easy explanation: Low pass filters, modulators,and signal paths must be properly matched for effective representation of input signal in quadrature sampling. Amplitude mismatch, inconsistent time duration in filters may lead to degradation of complex signal.