Broadband Amplifier Circuit With Separated Paths for Gain Stability
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Solution Overview
Problem
In broadband amplifiers, achieving high gain while maintaining stability and low sensitivity to process, voltage, and temperature (PVT) conditions is challenging, as increasing gain typically reduces phase margin and stability.
Innovation Solution
The design incorporates a feedforward path with a separation unit, current mirror, and folding unit in the amplification circuit, where the second current is greater than the first current by a specific ratio, and transistors in the second path are larger, ensuring high gain and broadband characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gain of a broadband amplifier is increased, then the feedback gain approaches 1/f providing accurate feedback, but the phase margin is reduced and stability is lowered
Solution Approach 1:
The amplifier is divided into multiple parallel paths (first path with first amplification circuit, second path with second amplification circuit) that process signals differently. The first path handles high-gain amplification while the second path provides broadband signal processing, allowing the system to achieve both high feedback accuracy and stability through path segmentation.
Solution Approach 2:
A separation unit acts as an intermediary between the two amplification paths, controlling and balancing the signals from each path before they are combined. This intermediary component enables the system to reconcile the conflicting requirements of high gain (from first path) and stability/bandwidth (from second path) by mediating their interaction.
2Productivity
If transistors in the second path are made larger to increase current, then bandwidth and linearity are improved, but device complexity increases
Solution Approach 1:
Different transistor sizes are used in different paths according to their specific functional requirements. The second path uses larger transistors optimized for broadband operation and high current handling, while the first path uses appropriately sized transistors for high-gain amplification. This local optimization allows each path to excel at its specific function without unnecessarily increasing overall complexity.
Data Source
AI summary
The apparatus relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long-Term Evolution (LTE). The disclosure relates to an apparatus including an electronic circuit for amplifying a signal. The apparatus includes a transceiver including an amplification circuit, and at least one processor coupled to the transceiver. The amplification circuit includes a first path to generate a first current corresponding to a voltage of an input signal, a second path to generate a second current corresponding to a voltage of the input signal, a separation unit to control each of the first current and the second current, a current mirror to generate a third current corresponding to the first current, and a folding unit to generate an output signal on the basis of the second current and the third current.