Mixer-First Receiver with wide-RF Range

TL;DR

This paper introduces a mixer-first receiver design that uses on-chip high-Q bandpass filtering and impedance tuning to achieve a wide RF range, eliminating the need for bulky off-chip filters.

Contribution

It presents a novel passive mixer-based receiver architecture with on-chip high-Q filtering and impedance tuning for wide RF coverage.

Findings

Achieved wide RF range through impedance tuning.

Replaced off-chip SAW filters with on-chip high-Q bandpass filter.

Demonstrated effective impedance matching for antenna compatibility.

Abstract

In the Passive Mixer first receiver, four mosfet, and four baseband impedance can synthesize High-Q bandpass filter. This on-chip High-Q bandpass filter can replace bulky, expensive and off-chip SAW filters. The impedance which is seen by the antenna is tuned by switch resistance of the Passive Mixer and the input impedance of the Trans-impedance amplifier (baseband impedance) to match antenna impedance. The gain of the feedback loop of the TIA controls the input impedance of the TIA. Further, M baseband impedance can be replaced by M/4 complex impedance. This complex impedance provides a wide RF range by changing the transconductance.