Amplifier With Control Circuits TRIZ Cases

A delayed RF envelope prediction modulates CATV amplifier supply voltage to lower Class A power dissipation with minimal signal-quality impact.

A differential signal carries both envelope and phase correction data, cutting ETIC pin count, footprint, and cost in RF power management.

A delay module aligns RF amplification and control signals to improve MRI power amplifier correction stability and reduce imaging artifacts.

A delay module synchronizes RFPA amplification and control signals to improve nonlinear correction and reduce MRI imaging artifacts.

Degeneration resistors and constant bias current keep VGA phase and input impedance stable across gain settings in RF circuits.

Measured battery voltage and offset-mode prediction let the DSP counter amplifier gain drift and reduce noise in hearing-device audio.

A controller switches a transmitter power amplifier between linear and non-linear modes to cut energy use while meeting bandwidth and spectral leakage needs.

A controller switches the power amplifier between linear and non-linear modes by allocated bandwidth to cut energy use and limit spectral leakage.

Pre-distorting the RF signal in a remote antenna unit cancels power amplifier nonlinearity, cutting power use, heat, and amplifier size.

Feedback-based supply-envelope pre-distortion keeps RF PA gain constant across VCC changes, improving linearity and spectral emissions.