Resonant Long Antennas TRIZ Cases

Parallel CMOS amplifier sub-units are selectively switched and resonantly combined to raise gain, improve isolation, and cut power use.

Separate load-line matching and harmonic phase termination improve power amplifier PAE, linearity, and baseband performance.

Real-time distortion feedback adjusts RF power amplifier supply voltage to cut power waste while keeping spectral occupancy within limits.

Dynamic PA control reduces amplitude-loop glitches during rapid envelope changes, improving RF efficiency and lowering distortion.

A dual RF PA stage with an alpha switch reuses one amplifier as driver or final stage to cut multi-band circuitry complexity and power use.

A cost-function approach selects RF power amplifier supply voltage to balance ACLR margin, linearity, and current savings.

A PCB loopback test signal lets the RF circuit auto-correct transmitter and receiver gain shifts, improving linearity and reducing I/Q mismatch.

By mapping transmit power to PA supply voltage, one RF module can cover multiple output levels while reducing amplifier variants and overvoltage risk.

Signal-ratio monitoring detects amplifier self-oscillation and dynamically reduces gain to limit wireless network interference.

Independent gain paths in a shared RF front end let Wi-Fi and Bluetooth run concurrently without clipping, cutting components and power.

Dynamic reactance tuning keeps a short antenna resonant with the instantaneous transmit frequency, improving bandwidth and power efficiency.

Dynamic enable-signal timing lets a TDMA power amplifier meet PVT requirements across power control levels, including high PCLs.

Separating predistortion into narrowband traffic and wideband correction paths cuts receive-band noise, preserves linearity, and eases RF filtering.

Parallel trap circuits and a tank inductor shunt harmonic signals while staying high impedance at the fundamental frequency to preserve amplifier efficiency.

Analog RF predistortion linearizes broadband power amplifiers without the high sampling rates, cost, and power draw of digital DPD.

Combining memory-less predistortion with FIR and IIR filters helps power amplifiers correct short- and long-term memory distortion.

Using the feedback receive path instead of external detectors, this case speeds wireless transmit power control and helps detect interferers.

By shifting or canceling envelope-tracking ripple sidebands, this RF transmitter case reduces adjacent-band emissions and supports protocol compliance.

Per-channel gain limiting and GPS-backed oscillator control help RF repeaters prevent overdrive, spurious emissions, and frequency drift.

Switching the baseband filter and upconverter between Class-A and higher-efficiency modes cuts low-power transmitter drain while preserving linearity.

Load-impedance-based bias control helps a transmit circuit preserve ACLR and EVM while cutting current draw under changing antenna conditions.

Local monitoring of mismatch, temperature, and current lets the PA hold input drive steady while adjusting gain for maximum transmit power.

A source-follower mixer with feedback and filtering suppresses strong blocker leakage so weak RF signals can be extracted with low noise.

A single PLL plus integer dividers covers multiple RF bands for direct conversion, cutting synthesizer count, cost, and board space.

A switchable harmonic trap detunes the PA output filter and matching network to block low-band harmonics from leaking into the high-band path.

By combining remote transmitter gain with local receiver gain, the receiver reduces risky frequency-band gain before feedback howling occurs.

Multiple tuning signals let mechanical resonator oscillators match arbitrary frequencies, reducing quartz precision demands and manufacturing cost.

Dynamic bias current control selectively drives amplifier stages to raise low-power gain while cutting total current in mobile radios.

A series active-device stage with a bypass capacitor isolates RF transients during TDD pulsing, keeping dynamic EVM low and linearity stable.

Adjusting PA bias by channel bandwidth and subcarrier count cuts transmitter current draw while preserving ACLR in mobile radios.

A timed isolation state holds RF switch transistors before power-off, preserving sleep-mode isolation and reducing unwanted emissions.

Uses low-speed USB EOP and SYNC timing to self-calibrate an RC oscillator, avoiding NVM programming and laser trimming costs.

Switching RF power amplifier compression by duplex frequency improves envelope-tracking efficiency while limiting spectrum degradation.

A cost function combining ACLR margin and current savings identifies the RF power amplifier supply voltage that balances linearity and power use.

Predictive window clipping cuts SC-FDMA uplink peaks while limiting spectral growth and reducing power amplifier battery drain.

Antenna-feed power detection closes the PA control loop to stabilize gain, improve efficiency, and cut multi-band detector hardware.

Receiver-measured EVM guides transmitter gain control, raising power only within distortion and regulatory limits to cut data loss and bit errors.

Two switched supplies and mode-selective LC paths let an RF PA meet ripple limits in saturated mode without excessive envelope-tracking current.

A high-Q BAW oscillator with PLL, divider, and VCO stages delivers tunable RF output while preserving spectral purity and low phase noise.

An analog feedback loop with digital attenuation delivers precise radio power control across selectable levels without calibration or signal disruption.

Closed-loop bias control handles amplitude while open-loop phase modulation cuts PA control complexity and battery demand in EDGE transmitters.

A 1.5V shared PA driver with passive mixers and passive low-pass filtering cuts transmitter power and die area without hurting multi-band performance.

Alarm-aware supply modulation freezes or maximizes PA voltage during impairments or faults to preserve efficiency and avoid ACP degradation.

A threshold-controlled bypass lets input voltage pass directly at high-efficiency points, cutting noise and extending battery life in RF transmitters.

Combining quadratic and linear predistortion helps a wideband mixer suppress harmonic distortion and carrier artifacts across UWB frequencies.

A low-pass filter stabilizes power-amplifier bias in a WLAN transmitter, cutting switching noise and improving output linearity.

A self-adaptive twin bias circuit improves mixer linearity without hurting gain, while reducing components, area, cost, and temperature sensitivity.

Frequency-division data retunes amplifier load impedance so tuned stages keep similar power gain across wide channel bandwidths.

Time-aligning PLL and power amplifier feedback signals minimizes phase disturbance during loop switching and helps maintain lock.

A current-mode CMOS transmitter removes V-I and I-V conversions to cut power, reduce parts, and keep gain control more linear.

A reconfigurable RF power amplifier adjusts transistor size, bias current, and matching to share circuitry across wireless standards.

A lower-bounded envelope waveform with constant ramp-period voltage cuts phase distortion and improves RF power amplifier efficiency.

A mapped variable-gain control path preserves AM signals in GSM transmitters while compensating power amplifier gain variation and cutting power use.

Statistical CNR monitoring with SPC and fuzzy logic stabilizes receiver gain control against noise and transient input instability.

Switchable Doherty amplifier paths cut power dissipation and distortion when a MIMO transmitter shifts to higher-output non-MIMO mode.

An RF switch opens one amplifier path at low output levels, enabling impedance tuning that reduces current draw and power leakage.

Dynamic tuning resolves multi-band efficiency trade-offs by enabling simultaneous operation on different channels with a single antenna.

A transmitter adjusts transconductor bias current to suppress DC offset while maintaining LO carrier rejection.

Segmented radiation loops form dual current paths that resolve the trade-off between single-path simplicity and improved high and low frequency efficiency.

Segmenting power conversion into switch-mode and linear stages reduces noise in RF circuitry while maintaining high efficiency and extending battery life.

IQ modulation circuitry shifts the maximum energy spectrum peak away from the RF carrier frequency during ramp-down.