Nested Transimpedance Receiver Circuit for Low-Noise Wideband Gain

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wideband receivers face challenges with high noise figure, poor linearity, large chip area, and high power consumption due to source impedance matching issues.

Innovation Solution

A signal amplifying circuit device comprising a mixer and nested transimpedance amplifiers with specific resistor configurations and CMOS circuit units, which receive RF signals with preset phase-difference local oscillator signals to improve impedance matching, reduce noise, and enhance gain and linearity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If source impedance matching is implemented in traditional wideband receivers, then gain is improved, but noise figure increases and linearity deteriorates

Engineering Contradiction:

ImprovegainVSAvoidnoise figure

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The receiver is divided into two functional segments: an impedance-matching stage (mixer and first amplifier) that optimizes gain, and a nested transimpedance amplifier stage that optimizes noise figure and linearity. Each segment is designed to excel at its specific function rather than trying to optimize all parameters in a single stage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first amplifier acts as an intermediary between the mixer and the nested transimpedance amplifier. It provides impedance transformation and signal buffering, allowing the mixer to operate with optimal impedance matching while preparing the signal for the low-noise transimpedance amplification stage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If source impedance matching is implemented in traditional wideband receivers, then gain is improved, but linearity deteriorates

Engineering Contradiction:

ImprovegainVSAvoidlinearity

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Reliability

If traditional receiver architecture is used, then source impedance matching is achieved, but chip area increases and power consumption increases

Engineering Contradiction:

Improvesource impedance matchingVSAvoidchip area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent merges multiple functions into the nested transimpedance amplifier structure. The first amplifier and second amplifier work together in a nested configuration where the first amplifier provides impedance matching and the second amplifier provides transimpedance conversion, achieving both functions in a compact integrated structure rather than requiring separate discrete components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The nested transimpedance amplifier structure serves multiple functions simultaneously: it provides impedance matching, signal amplification, noise figure optimization, and linearity improvement. This multi-functional design eliminates the need for separate dedicated circuits for each function, reducing overall chip area.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Reliability

If traditional receiver architecture is used, then source impedance matching is achieved, but power consumption increases

Engineering Contradiction:

Improvesource impedance matchingVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by stationary object

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11190142B1Signal amplifying circuit device and receiver

Publication Date: 2021.11.30 HANGZHOU GEO-CHIP TECH CO LTD

AI summary

A signal amplifying circuit device comprises a mixer and a first and second amplifiers connected in series, where the mixer is configured to receive an RF signal and two LO signals with a preset phase difference therebetween and output a first and a second mixed signals, the first amplifier includes a first input terminal for receiving the first mixed signal, a second input terminal for receiving the second mixed signal, and a first and second output terminals, the second amplifier includes a first input terminal connected to the first output terminal of the first stage of amplifier at a first joint, a second input terminal connected to the second output terminal of the first stage of amplifier at a second joint, a first output terminal, and a second output terminal. A receiver including the signal amplifying circuit device is also disclosed.