DC-Coupled Amplifier Bias Control Without Off-Die Capacitors
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Solution Overview
Problem
Existing distributed amplifiers are large and costly due to separate pre-driver and output driver stages, requiring off-die AC coupling capacitors that increase size and expense while limiting bandwidth and gain.
Innovation Solution
A DC-coupled amplifier system where a pre-driver, amplifier, and bias control circuit are integrated on a single Gallium Arsenide die, eliminating the need for off-die capacitors and allowing for reduced size and cost while maintaining or increasing gain and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If separate pre-driver and output driver stages are used, then gain and bandwidth are improved, but size and cost increase due to requiring off-die AC coupling capacitors
Solution Approach 1:
The patent combines the pre-driver stage and output driver stage into a single integrated circuit die, eliminating the need for separate off-die AC coupling capacitors. This merging of previously separate stages reduces the overall amplifier size while maintaining the gain and bandwidth benefits of multi-stage amplification.
Solution Approach 2:
The patent extracts and eliminates the external AC coupling capacitors from the amplifier system by implementing DC coupling between stages on the same die. This removal of external components reduces size, cost, and complexity while preserving the essential signal coupling function.
2Power
If separate pre-driver and output driver stages are used, then gain and bandwidth are improved, but cost increases due to requiring off-die AC coupling capacitors
Solution Approach 1:
The patent combines the pre-driver stage and output driver stage into a single integrated circuit die, eliminating the need for separate off-die AC coupling capacitors. This merging of previously separate stages reduces the overall amplifier size while maintaining the gain and bandwidth benefits of multi-stage amplification.
Solution Approach 2:
The patent extracts and eliminates the external AC coupling capacitors from the amplifier system by implementing DC coupling between stages on the same die. This removal of external components reduces size, cost, and complexity while preserving the essential signal coupling function.
3Speed
If separate pre-driver and output driver stages are used, then bandwidth is improved, but device complexity increases due to requiring off-die capacitors
Solution Approach 1:
The patent combines the pre-driver stage and output driver stage into a single integrated circuit die, eliminating the need for separate off-die AC coupling capacitors. This merging of previously separate stages reduces the overall amplifier size while maintaining the gain and bandwidth benefits of multi-stage amplification.
Solution Approach 2:
The patent extracts and eliminates the external AC coupling capacitors from the amplifier system by implementing DC coupling between stages on the same die. This removal of external components reduces size, cost, and complexity while preserving the essential signal coupling function.
Data Source
AI summary
A dc coupled amplifier includes a pre-driver, and amplifier and a bias control circuit. The pre-driver is configured to receive one or more input signals and amplify the one or more input signals to create one or more pre-amplified signals. The amplifier has cascode configured transistors configured to receive and amplify the one or more pre-amplified signals to create one or more amplified signals, the amplifier further having an output driver termination element. The bias control circuit is connected between the pre-driver and the amplifier, the bias control circuit receiving at least one bias current from the output driver termination element of the amplifier, wherein the pre-driver, the amplifier and the bias control circuit are all formed on a same die.