Power Amplifiers TRIZ Cases

Parallel Class A and Class AB/B amplifier paths switch by signal level to hold low EVM while extending RF output power.

Combining binary ΔΣ transmitter outputs with different initial values raises signal-to-noise ratio without multilevel amplifiers or multiple power supplies.

Dual-feed hybrid couplers and adaptive bias tracking improve gain, isolation, and efficiency in N-way Doherty amplifiers at high output back-off.

Phased amplifier cells cancel harmful harmonics at the output, removing external filters to cut distortion, power use, and component count.

An on-chip LDO isolates the CMOS transceiver power amplifier from supply and bonding-wire noise, enabling adjustable output power and better efficiency.

A closed-loop cascode reference bias circuit stabilizes CMOS amplifier current under supply variation while improving output resistance and RF adaptability.

A transformer and impedance-matching combiner isolates outphasing power amplifiers while cutting resistor loss, distortion, and EVM.

A single-bit LVDS envelope signal preserves RF integrity over wider bandwidths while cutting power amplifier consumption and battery drain.

Analog quadrature pulse generation removes digital clock limits in outphasing class-D amplifiers, improving RF range, EVM, and spurious noise.

Multiple base-band envelopes are encoded into PWM paths and combined after amplification to generate multi-band RF with lower complexity and fewer spurious tones.

A symmetrical transformer-coupled transmitter boosts metal detector efficiency, tuning range, and sensitivity while keeping distortion low.

Simultaneous envelope-voltage control of main and auxiliary amplifiers cuts back-off efficiency loss while preserving linearity in base stations.

PIN diodes and fractional-wavelength lines cut RF switch power loss and heat, enabling wide-voltage operation without complex cooling.

Complex load admittance at the combining point helps a Doherty amplifier sustain high efficiency across a wider frequency range.

A multi-stage RF matching network separates broadband impedance transformation and second-harmonic phase control to improve amplifier efficiency.

A DAT-based CMOS power amplifier and transmit/receive switch use bond-wire reactance compensation to improve isolation and limit voltage swings.

A negative-capacitance reflective trap suppresses RF power amplifier harmonics with low loss, reducing external filter needs.

Injected tones and IIR filtering suppress self-interference in an SDR front end, enabling duplexerless multi-band operation with lower size and power.

Dynamic bias control keeps subthreshold detection transistors linear across wide RF amplitudes, reducing calibration burden and external ED need.

Dynamic bias switching lets an RF amplifier balance linearity and efficiency across power levels by adjusting bias voltage and current.

Coupled gate and source inductors let a nanoscale MOSFET PA cell achieve 50Ω matching without external networks, cutting voltage, power, and IC area.

Output-power sensing sets static and dynamic supply voltages so an RF power amplifier tracks signal envelope, cuts heat, and extends communication time.

A switchable matching network alternates inductive and capacitive reactance to cut tuning losses and improve power amplifier back-off efficiency.

An integrated microstrip coupler filter cuts PCB area and differential loss while improving impedance matching and harmonic restraint in Doherty amplifiers.

A self-aligned edge interpolator removes coarse-fine DTC misalignment, enabling calibration-free wideband phase interpolation with lower noise.

Mutually coupled open-circuited transmission lines broaden Doherty amplifier bandwidth while preserving back-off efficiency and lowering power use.

Pre-mixer baseband correction cancels RF pulling-induced phase error in compact transmitters without high-bandwidth calibration or PLL noise.

Integrated impedance matching and passive bandwidth modifiers widen Doherty amplifier operation while preserving efficiency and low distortion.

Dynamic biasing driven by envelope detection cuts wasted baseband amplifier power while preserving linearity and reducing spurious emissions.

Lumped-element network transforms remove output transformers to keep 50-ohm matching, broad bandwidth, and high amplifier efficiency.

A robustness signal updates predistortion parameters in real time to prevent abrupt power shifts and abnormal spectra in cross-band amplifiers.

A 4-section 8-way transformer combiner shrinks RF amplifier area while improving heat dissipation and simplifying on-die routing.

Parallel resonant tank paths let a Doherty PA match and isolate multiple bands, preserving consistent base station amplifier performance.

An LNA boosts the RF receive signal before the coaxial path, enabling antenna swapping with lower insertion loss and better receiver sensitivity.

Staggered RC networks add zeros that offset load-induced poles, stabilizing capacitive-load amplifiers while reducing phase shift and power use.

Transformer coupling and load impedance matching reduce combiner loss and PA interference, improving RF transmitter linearity.

Coupling gate capacitors across an RF transistor stack raises usable capacitance above stray parasitics while preserving voltage distribution.

Placing a SAW-based separator between low-band and high-band circuits cuts coupling and harmonic leakage in compact carrier aggregation RF modules.

Two-level interleaving and summation let an RF DAC span 400 MHz to 4 GHz while reducing spurs, filter complexity, and power dissipation.