Common-source common-gate amplifier
By adding branch modules and cross-coupling modules to a single-stage cascode amplifier, the problem of traditional cascode amplifiers being unable to achieve high gain and short settling time under low power supply voltage is solved, achieving high gain, wide bandwidth and high slew rate.
CN115514332BActive Publication Date: 2026-07-07CHENGDU LIGHT COLLECTOR TECH
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Patent Information
- Application Number
- CN202211267936.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-10-17
- Publication Date
- 2026-07-07
- Estimated Expiration
- 2042-10-17
AI Technical Summary
Technical Problem
In complementary metal-oxide-semiconductor (CMOS) technology, traditional folded cascode amplifiers struggle to achieve high gain, short settling time, and high signal establishment accuracy at low supply voltages, and two-stage amplifiers require significant power consumption and area.
Method used
A single-stage common-source cascode amplifier structure is adopted, and first and second branch modules are added to increase the small signal path. A positive feedback loop is formed through a cross-coupling module to improve the small signal settling speed and large signal slew rate.
Benefits of technology
Without increasing power consumption, the circuit gain, bandwidth, and slew rate are improved, and the signal settling time is shortened.
✦ Generated by Eureka AI based on patent content.
Abstract
The application provides a common-source common-gate amplifier, comprising a signal input module, which is used for generating an input signal according to a power supply voltage; a cross-coupling module, which is electrically connected with the signal input module and is used for forming internal positive feedback according to an output signal; a first biasing module, which is electrically connected with the cross-coupling module; a first branch module, which is electrically connected with the first biasing module; a second biasing module, which is electrically connected with the cross-coupling module; a second branch module, which is electrically connected with the second biasing module; wherein the first biasing module and the second biasing module are used for providing biasing after an input common-mode feedback voltage, the first branch module and the second branch module are used for providing large-swing output biasing, and the first branch module and the second branch module are respectively electrically connected with the signal input module, and the signal input module is further used for outputting branch signals to the first branch module and the second branch module. The application improves the voltage swing, the gain and the bandwidth of the circuit under the single-stage amplifier structure.
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