Modulation Transference TRIZ Cases

A split LO path cuts current draw by selectively activating frequency dividers while phase detection keeps master and slave outputs aligned.

Switching a radio receiver between low and high IF frequencies avoids jamming desense while limiting baseband power use.

Embedded passive CLC filtering and segmented LO paths improve harmonic rejection across a wide RF range while lowering LO frequency and power.

Using dual PLLs, external frequency division, and selective mixer paths, this case improves tuning range while keeping phase noise low.

A programmable filter between predistortion and upconversion cuts out-of-band noise, preserving spectral purity at low supply voltage.

A 40 MHz baseband high-pass filter cuts low-frequency coupling in 60 GHz direct-conversion transmitters, reducing pulling and lock issues.

Offset current injected at mixer common nodes suppresses local oscillator leakage and balances signal paths with less circuitry.

Phase differencing and summation filtering let a passive RF receiver reject odd harmonics without SAW filters or an LNA, reducing power and area.

Polyphase filtering, a baseband notch filter, and frequency translation down convert RF signals while cutting power use and suppressing spurious signals.

Variable shunt capacitance and switch-coupled inductors stabilize RF impedance under VSWR changes while limiting insertion loss.

Inductive loads across I/Q mixer inputs raise conversion gain and cut local oscillator loss, helping RF receivers lower noise and LNA cost.

Residual odd harmonics are reduced by digitally tuning LO phase and gain in a harmonic reject mixer to offset mismatch across wide-band operation.

Averaging mixer output common-mode voltage and feeding back the error cuts DC offset during IF-to-baseband downconversion without added offset.

Shared FET terminals in a compact MMIC ring mixer cut die area and interconnect length, reducing parasitics and improving high-frequency linearity.

Wavelet analysis finds idle time-frequency cells so wireless links can transmit in unused spectrum with lower co-channel interference.

Separate coarse and fine tuning loops widen frequency coverage while preserving fine resolution and filtering quantization noise.

A current-domain down-conversion mixer integrates baseband processing to cut noise coupling, chip area, and power in RF SoC layouts.

Parallel mixers and integrators separate simultaneous node responses, cutting RF receiving time while preserving decoding accuracy.

A two-port mixer and power harvester replace MRI coaxial cables, enabling wireless signal transmission with fewer components and no external power.

Sequentially rotating the mixed signal through gain stages improves harmonic rejection while reducing mixer power and area.

Negative feedback in a mixer transconductor compares emitter voltage to a reference to cancel IM2 distortion in direct conversion receivers.

Continuous-time front-end filtering plus discrete-time down-conversion suppresses harmonic mixing while cutting wideband receiver area and power.

A Doppler-based optical modulator creates a local oscillator that tracks a variable signal, keeping intermediate frequency narrow and SNR high.

Re-clocking differential I/Q local oscillator signals to a reference edge improves quadrature accuracy, phase noise, and image rejection in RF mixers.

Cyclic switching across weighted gain stages reduces mismatch and phase errors, improving harmonic rejection with lower power and die area.

Multiple non-linear gain windows expand receiver dynamic range while reducing AGC complexity, power use, and signal compression risk.

Integrated stage-select circuitry lets one mixer input or gain path run at a time, avoiding external switch and VGA losses in noise figure and linearity.

Transformer-coupled I/Q mixer loads widen local oscillator band coverage while preserving frequency selectivity and reducing circuit complexity.

A single ultrasonic vibrator handles transmit and receive cycles to cut installation space, limit interference, and expand monitoring coverage.

Capacitive signal addition and MOS square-law mixing remove separate adding stages, cutting DC bias power in low-voltage radio mixers.

Phase-offset LO signals from divide-by-N and divide-by-three stages cancel third harmonics without bulky high-Q or poly-phase filters.

Independent RF and LO biasing with microstrip and RC networks improves mixer noise figure, linearity, and isolation at lower supply voltage.

A mixer feedback loop cuts DC offset and IM2 from TX leakage, enabling SAW-free multiband RF receivers with lower cost and PCB area.

A configurable feedback loop and resonance tank suppress DC offset, IM2, and TX leakage while removing SAW filters in multiband receivers.

Balanced up/down-conversion and selective mixer activation cut noise, interference, and power use in multi-radio receivers.

A dual-frequency four-phase clocking scheme drives passive quadrature mixers to improve linearity and cut receiver power use.

Alternating current away from the Gilbert cell cuts flicker noise and improves mixer noise figure under low-voltage MOS operation.

Current-source and sink stages with AC coupling keep MOS current direction stable in a passive mixer, cutting distortion and intermodulation.

Non-overlapping I/Q LO mixing shifts filtering to baseband, delivering wideband RF matching with lower noise figure and strong blocker rejection.

Multiple on-chip frequency converters split serial data into different bands, cutting SERDES power and signal attenuation at high throughput.

A resonant circuit suppresses 3LO and 5LO mixer products, easing PA driver linearity demands and cutting transmitter power use.

Multiple LO paths, phase converters, and signal combining cancel mixer harmonics, cutting noise without complex gain adjustment.

Mixers, filters, and DSP split a combined RF input into I/Q paths, enabling dual-channel reception without adding a second receiver.

A single-stage poly-phase filter and matched amplifier gains correct quadrature amplitude mismatch in low-IF receivers without calibration cycles.

Serial inductors in the LNA resonate with mixer parasitic capacitance to cut flicker noise, power use, and circuit area.

Cross-coupled NMOS negative-gm feedback lets a Gilbert mixer saturate at 150 mV, improving transmit-chain efficiency and baseband linearity.

Variable LO phase resolution and per-phase gain suppress odd-order harmonic interference across wide receiver bandwidths with lower area and power.

Weighted summation across four phased mixer paths cancels down-converter harmonics, improving radio sensitivity and linearity.

By offsetting baseband amplitudes around DAC half scale, this ASK modulator enables 0-100% depth with lower clock leakage and better mixer linearity.

Multiple LO transformers and selectable mixer cores extend LO band coverage while preserving linearity and reducing LO loss in RF mixers.