Patent ID: 8306498
Filing Date: 2012-11-06
Classification: H03D,H04B

Abstract:
1. A wideband receiver comprising: an front-end unit configured to receive and perform low-pass filtering on a wideband input signal in a continuous-time domain, the front-end unit including at least one tunable low pass filter configured to perform low-pass filtering on the wideband input signal while changing a cutoff frequency according to a frequency of the wideband input signal; and a down-conversion unit configured to sample and hold an output signal of the front-end unit according to a local oscillator signal and perform low-pass filtering on the output signal in a discrete time domain, wherein the tunable low pass filter comprises: first and second resistors coupled in series between an input terminal and an output terminal; a first capacitor coupled to and disposed between a ground terminal and the output terminal; a second capacitor and an output resistor coupled in series between the ground terminal and a contact point of the first resistor and the second resistor; and a buffer coupled to and disposed between the output terminal and a contact point of the second capacitor and the output resistor.