3. Analog CMOS Circuit Design - Part 1: Design Principles of Operational Amplifiers in CMOS
CMOS operational amplifiers are pivotal in analog circuit design, offering high performance in applications such as amplification and filtering. The chapter covers essential design principles, key components, performance metrics, and methodologies for designing CMOS op-amps. Emphasizing the importance of high gain, low distortion, and stability, it explores the interconnections among various op-amp components and their impact on overall functionality.
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What we have learnt
- Operational amplifiers (op-amps) are crucial for signal processing in various electronic applications.
- High-performance CMOS op-amps require careful consideration of configurations, biasing, and performance metrics.
- Performance metrics such as gain, CMRR, and THD are vital for evaluating op-amp quality in practical applications.
Key Concepts
- -- Operational Amplifier (OpAmp)
- An analog component used for amplification, filtering, and signal conditioning in electronic systems.
- -- CommonMode Rejection Ratio (CMRR)
- A measure of an op-amp's ability to reject common-mode signals, ensuring that only differential signals are amplified.
- -- Slew Rate
- The maximum rate at which an op-amp can change its output voltage, crucial for high-speed applications.
- -- Unity Gain Bandwidth (GBW)
- The frequency at which the open-loop gain of an op-amp drops to unity, indicating its frequency response performance.
- -- Differential Pair
- A configuration of transistors that amplifies the difference between two input signals, forming the core of op-amp design.
- -- Current Mirror
- A circuit configuration that allows the current to be mirrored or copied in another part of the circuit, essential for high gain in op-amps.
- -- Miller Compensation
- A technique used to stabilize high-gain op-amps by adding a capacitor to control bandwidth and phase margin.
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