Wideband Amplifier Current Reuse for Block Isolation
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Solution Overview
Problem
Conventional amplifiers fail to provide effective isolation and gain over a wideband frequency range due to the narrow frequency band isolation offered by inductor-capacitor circuits, limiting their use in transceivers operating across a wide range of frequencies.
Innovation Solution
The use of an isolation circuit that allows current reuse by coupling the bias current through multiple amplification blocks, providing isolation between them without relying on inductor-capacitor circuits, thereby increasing transductance and reducing noise while enabling wideband operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductor-capacitor isolation circuits are used to isolate amplification blocks, then isolation between blocks is achieved, but the frequency bandwidth is limited to a narrow range
Solution Approach 1:
The patent replaces the traditional inductor-capacitor isolation circuit (LC circuit) with a transistor-based isolation circuit. The transistor's impedance characteristics (high impedance at collector, low impedance at emitter) provide the necessary isolation between amplification blocks without the frequency-selective nature of LC circuits, thereby enabling wideband operation while maintaining block isolation.
2Use of energy by moving object
If current is not reused between amplification blocks, then each block operates independently, but power consumption increases
Solution Approach 1:
The patent merges the current paths of multiple amplification blocks by configuring transistors to share common current paths. The isolation circuit transistors are arranged so that their current paths combine with the main amplification blocks, allowing current reuse. This reduces total power consumption while the transistor impedance characteristics maintain the necessary isolation between functional blocks.
Data Source
AI summary
In one embodiment, an apparatus includes a first amplification block configured to receive a signal. A second amplification block is configured to output the signal where the outputted signal is amplified. The isolation circuit allows reuse of a current flowing through the second amplification block by coupling the current to pass through the first amplification block. Also, the isolation circuit provides isolation between the first amplification block and the second amplification block to restrict the signal from flowing through the isolation circuit.