IF-noise-shaping transistorized current-mode lowpass filter utilizing cross coupled transistors

摘要

An IF-noise-shaping transistorized current-mode lowpass filter is applied to quadrature in a balanced circuit. A first pair of transistors receiving current inputs from a mixer are connected so that each of the first pair of transistors has its gate cross coupled to the output of the other of the first pair of transistors. A second pair of transistors are connected in series with respected outputs of respective ones of the first pair of transistors and having gates connected to a first common voltage node, and a capacitance is used to connect the current inputs of one of the first and second pairs of transistors. An active inductive load is connected between the current inputs of one of the first and second pairs of transistors.

主权项

1. An IF-noise-shaping transistorized current-mode lowpass filter comprising:
a first pair of transistors receiving current inputs from a mixer, both of the first pair of transistors having its gate cross coupled to the outputs of the other of the first pair of transistors; a second pair of transistors, each of said second pair of transistors connected in series with respected outputs of respective ones of the first pair of transistors and having gates connected to a first common voltage node; a capacitance connecting the current inputs of one of the first and second pairs of transistors; and an active inductive load connected between the current inputs of one of the first and second pairs of transistors.