Amplifier Combinations TRIZ Cases

Dynamic and static cascade transistors stabilize collector-emitter bias, enabling higher optical modulator drive swing without waveform breakdown.

By splitting audio signals and driving a low-frequency vibrator against a resonance medium, this case improves bass output without a major speaker redesign.

Using three transconductance stages and Schottky level shifting, this GaN op amp improves bandwidth, linearity, noise, and power handling.

By splitting input admittance across primary and secondary amplifiers, this LNA chain lowers power use while preserving gain and low input impedance.

Backgate voltage control tunes VGS in an active cascode without changing geometry or drain current, improving low-voltage headroom, bandwidth, and Rout.

A shared common terminal and feedback network give a MIMO amplifier pseudo-differential inputs that cut coupling noise without extra differential stages.

Ft doublers in a cascode differential RF amplifier raise bandwidth, gain, and input impedance while reducing high-frequency phase distortion.

A reactive multiport combiner keeps PA loading substantially resistive across wide output power ranges, improving outphasing efficiency for high-PAPR RF signals.

A tapered multi-section attenuator masks bias inductor self-resonance in traveling wave amplifiers, preserving impedance match and power efficiency.

MISO RF amplification blends VPA control of impedance, bias, and outphasing to avoid combiner loss and cut distortion across output range.

A two-stage grounded-gate amplifier uses interstage and output inductors to keep 50Ω matching while boosting broadband voltage gain.

Lowering the Class D output-stage supply voltage during idle audio conditions cuts noise gain and improves dynamic range.

A switched buffer between the multiplexer and amplifier cuts filter current draw during clamp events, reducing settling time without bypassing ESD protection.

Digitally selectable Miller capacitors and impedances tune GBWP and phase margin across noise gains without external capacitors.

A constant impedance combiner widens Doherty amplifier bandwidth while maintaining backoff efficiency across adjacent frequency bands.

Dynamic addition of a second supply lets an RF power amplifier hold efficiency across output levels while reducing power use and cost.

Bias current is reused across amplifier stages to maintain isolation, boost transconductance, and avoid narrowband LC tuning.

A single shared RF choke and switchable MOS path cut Tx/Rx port loss, support high PA output power, and reduce CMOS transceiver cost.

Branch current detection in a balanced RF power amplifier improves output power control and linearity under VSWR mismatch.

Reverse-phase gate feedback cuts parasitic capacitance in a low-noise amplifier, improving input matching, noise, and bandwidth.

PWM frequency switching equalizes bridge loading in a gradient amplifier, cutting power loss and thermal stress while preserving coil fidelity.

A current bleeding branch lets an RF LNA vary gain while limiting load-resistor voltage to preserve output headroom, noise, and linearity.

A resonant LC network matches LNA input and output impedances while avoiding resistor thermal noise and lowering noise figure.

Asymmetric input splitting and below-threshold auxiliary bias raise Doherty amplifier gain and efficiency across a broader band.

Phase-shifted positive feedback in a cascode LNA boosts transconductance and gain while reducing noise factor without extra matching complexity.

Integrated power detectors let identical MMICs adapt carrier and peaking bias, cutting off-chip control complexity and manufacturing cost.

A wideband impedance transformer keeps the main amplifier load real across at least 25% RF bandwidth, reducing combining-network losses.

Wideband phase shifting and in-phase output combining resolve the efficiency-bandwidth tradeoff in Doherty and distributed amplifiers.

A transistor isolation circuit reuses bias current across amplifier blocks while preserving isolation, boosting gain and lowering noise over wideband operation.

Series-stacked pre-drivers let RF power amplifiers use higher battery voltage while keeping MOS transistors within safe limits and cutting regulator loss.

Lower peaking-amplifier load impedance lets a Doherty amplifier reach maximum output and sustain high drain efficiency at high input.

Stacked differential pairs with feedback and compensation broaden linear bandwidth in a CMOS high-current output stage for 40 Gb/s links.

A high-efficiency charge pump or buck converter replaces large bias capacitors and extra amplifiers to cut audio power use and BOM cost.

An on-die directional coupler in the RF output network enables transmit power monitoring without a separate external coupler, cutting size and cost.

A cascaded LNA and SAW filter layout rejects strong near-L1 ground transmissions while preserving GNSS gain and positioning accuracy.

Two parallel Class-E amplifiers use outphasing and asymmetrical tuning to sustain broadband power output with low dissipation.

Coupled self-oscillating Class D loops replace PWM sawtooth generation to widen bandwidth, cut distortion, and improve efficiency.

A linear voltage-to-current control path lets amplifier gain vary continuously while reducing sensitivity to supply, process, and temperature shifts.

A balun that switches to an unbalanced transformer splits impedance transformation, widening Doherty amplifier bandwidth while keeping efficiency and low loss.

Feedback around magnetically coupled planar inductors cuts class-D channel cross-talk, enabling compact multi-channel amplifier layouts.

Pairwise phase and gain matching in multiport amplifiers cuts tuning effort while maintaining acceptable isolation between output ports.

Independent back-gate control in a buffer circuit lowers amplifier output resistance and improves impedance matching to preserve signal quality.

Dynamic stage enabling matches Class D amplifier size to signal level, cutting idle dissipation while preserving output power.

A common-mode feedback loop senses output current and injects compensating current to cut EMI and preserve signal quality at low power.

Calibration and digital gain compensation keep mixer-slice asymmetry consistent across frequency, shortening RF transmitter tuning time.

Asymmetric branch coupling and tuned line lengths let 3, 5, or 7 transistor Chireix amplifiers reduce series losses and maintain efficiency.

A cross-coupled latch reads non-volatile memory bits without a reference current generator, cutting power, circuit complexity, and silicon area.

Differential subtraction across line and reference resistive circuits extracts received signals in full-duplex links while reducing noise and circuit complexity.

Cross-coupled inductive windings in an LNA cut FET noise, improving noise figure while keeping circuit area and cost low.

A distributed constant line and resistor raise second-transistor drain-source voltage by matching impedance and phase for higher RF output power.