Patent ID: 8035421
Filing Date: 2011-10-11
Classification: G11C,H04B

Abstract:
1. A front-end sampling radio receiver apparatus having a first and second band-pass charge sampling circuit comprising: a low pass filter with a bandwidth up to twice the clock frequency for receiving and filtering a radio signal, thereby producing a filtered signal; a low noise amplifier for producing a differentially amplified radio signal from the filtered signal; a local oscillator for producing an I-clock signal at its signal output; and a π/2 phase shifter with a signal input connected to the local oscillator for producing a Q-clock signal at its signal output with the same amplitude and π/2 phase shift with respect to said I-clock signal; wherein two ends of the signal output pair of said low noise amplifier are respectively connected both to the first band-pass charge sampling circuit and the second band-pass charge sampling circuit respectively, said I-clock signal output is connected to a clock input of said first band-pass charge sampling circuit, and said Q-clock signal output is connected to a clock input of said second band-pass charge sampling circuit, for producing base-band I-samples of said radio signal at a signal output or output pair of said first band-pass charge sampling circuit, base-band Q samples of said radio signal at the signal output or output pair of said second band-pass charge sampling circuit.