Volume Compression/Expansion Having Semiconductor Devices TRIZ Cases

Using sub-threshold and saturation-region control, this MOS gain-adjusting circuit delivers linear-in-dB amplification without extra compensation.

A wide-swing cascode mirror extends linear 74-dB gain control and cancels feed-forward leakage in 2 GHz WCDMA RF amplifiers.

An exponential DC converter and linear voltage multiplier let a CMOS VGA achieve linear-in-dB gain control despite MOS square-law behavior.

RC-controlled floating gates in a tapped-attenuator VGA cut switching distortion, improve linearity, and support stable CMOS gain control.

A wide-swing cascode mirror extends linear-in-dB gain tuning and cancels feed-forward isolation errors in 2 GHz WCDMA RF amplifiers.

Comparator-based monitoring of op-amp input terminal potential difference detects clipping accurately while preserving sound volume through controlled attenuation.

Voltage-controlled field effect transistors with capacitive coupling replace slow mechanical detectors to resolve response time and linearity trade-offs.

A CMOS variable gain amplifier merges saturation and triode regions within a feedback loop to control amplification.

A self-activating adjustable threshold limiter circuit uses capacitive coupling elements to control a voltage-controlled field effect transistor.

A saturation handler adjusts the VRAMP voltage to maintain stable power amplifier output.