A quadrature switching mixer is provided for mixing a received RF signal and a local oscillator signal, while rejecting an image signal associated with the RF signal.

The invention provides a mult i- standard RF transmitter including a power amplifier (6) for amplifying an RF signal prior to generating an output RF signal (7).

The IF signal includes a mixed product of the input RF signal and the input oscillator signal.

The method may include receiving the MF signal with the one or more second MF repeaters, converting the MF signal to a second HF signal using the one or more second MF repeaters, and sending the second HF signal to a second HF radio.

The invention relates to an HF system that comprises an HF device (5), particularly an HF lamp, as well an HF spark-plug or similar HF plasma application, and an HF signal-incoupling device (3) for operating said HF device (5).

The error signal is determined based on a difference between the distorted RF output signal and an analog RF reference signal (229) generated from the digital data.

A radio frequency (RF) mixer circuit that receives local oscillator inputs (LOp) and (LOm) and RF inputs (RFp) and (RFm), where the output (Vop) and (Vom) is a product of the RF input and local oscillator signal.

The RF connector (104) may be impedance-matched to minimize RF signal attenuation when connected to the RF test equipment.

The first clock signal (Fs) may be a digital approximation of a periodic analog signal such as an RF signal.

The RF signal received by one coil is phase shifted by 180°, amplified, and combined with the amplified RF signal received by the other coil.

The capacitances have a fixed and a movable electrode, with the RF signal coupled to the fixed electrode to avoid the springs needing to carry an RF signal.

A selective call radio frequency (RF) communication device (105) includes a receiver (203) for receiving and converting an RF signal into a converted signal.

While coupled to the external antenna, the portable RF telephone increases the amount of power used to transmit an RF signal.

In addition, the RF modulator (104) is programmable such that the RF signal is selectable for compatibility with a plurality of RF standards.

The fob reports the signal strength back to an electronic control unit using an RF signal.