Oscillators and Current Mirrors
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Sections
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What we have learnt
- Oscillators generate repetitive waveforms and require specific phase and gain conditions for sustained oscillations.
- The Barkhausen Criterion formalizes the necessary phase and magnitude conditions for oscillation in feedback systems.
- Current mirrors are used to replicate currents, crucial for biasing in analog circuits, with various improved designs enhancing performance.
Key Concepts
- -- Oscillator
- An electronic circuit that generates a repetitive waveform, such as a sine or square wave, without an external input signal.
- -- Barkhausen Criterion
- A set of conditions that must be met for a feedback system to sustain oscillations, involving both phase and magnitude.
- -- Current Mirror
- A circuit that produces a constant output current by mirroring a reference current, essential for biasing and amplified stages.
- -- Phase Shift
- The difference in phase between input and feedback signals in oscillators, crucial for determining oscillation frequency.
- -- Gain Condition
- Refers to the requirement that the loop gain of an oscillator must be equal to or greater than unity for sustained oscillation.
Additional Learning Materials
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