# 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.

## Key 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.

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Source: https://tomesphere.com/paper/1903.09564