Split Current Conveyer Mixer for Blocking Signal Tolerance
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Solution Overview
Problem
Current current conveyer technologies in RF transceivers face challenges in processing desired signals and blocking signals simultaneously without significant reduction in gain, especially when the blocking signal has a larger amplitude, and they often require high power dissipation and occupy significant die area.
Innovation Solution
The proposed solution involves a current conveyer circuit with a pair of frequency mixers and a current conveyer configured in a push-pull mode, using PMOS and NMOS transistors with cascode transistors, which allows for efficient processing of both desired and blocking signals without gain reduction and reduces power dissipation and die area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current conveyer technologies are used to process both desired and blocking signals, then signal processing capability is provided, but gain reduction occurs when blocking signal amplitude is large
Solution Approach 1:
The current conveyer is divided into multiple stages: a first stage that processes the desired signal and a second stage that processes the blocking signal. This segmentation allows each stage to handle specific signal components independently, preventing the blocking signal from causing gain reduction in the desired signal path while maintaining overall signal processing capability.
2Reliability
If conventional current conveyer technologies are used to handle large amplitude blocking signals, then signal processing is achieved, but power dissipation increases
Solution Approach 1:
The current conveyer is divided into multiple stages: a first stage that processes the desired signal and a second stage that processes the blocking signal. This segmentation allows each stage to handle specific signal components independently, preventing the blocking signal from causing gain reduction in the desired signal path while maintaining overall signal processing capability.
3Reliability
If conventional current conveyer technologies are used to process blocking signals, then signal handling is provided, but die area occupied increases
Solution Approach 1:
The circuit merges the desired signal path and blocking signal path into a single integrated current conveyer structure. The first and second stages are combined in a unified architecture that processes both signal types simultaneously, reducing the overall die area compared to separate processing circuits while maintaining full signal processing capability.
Data Source
AI summary
The disclosure relates to technology for an apparatus having a current conveyer comprising a first stage having a first differential input, and a second stage having a second differential input. The first and second stages are configured to operate in a push-pull mode to provide an output signal at a current conveyer output between the first stage and the second stage. The apparatus has a first frequency mixer configured to generate a first mixer signal based on an input signal and an oscillator signal having a first frequency. The first frequency mixer is configured to provide the first mixer signal to the first differential input. The apparatus has a second frequency mixer configured to generate a second mixer signal based on the input signal and a second oscillator signal having the first frequency. The second frequency mixer is configured to provide the second mixer signal to the second differential input.