One output from the splitter is fed to the LO port of a mixer.

In one design, the local oscillator circuit block includes a RF VCO with coarse and fine frequency tuning.

An optical carrier is modulated with a local oscillator signal at a modulation frequency substantially greater than the data signal to generate an optical local oscillator signal.

In a transmitter, a local oscillator (LO) generates an LO frequency signal.

The feedback loop includes a mixer that is responsive to a local oscillator.

A local oscillator input port receives a periodic sinusoidal local oscillator signal at a local oscillator frequency from an external local oscillator source.

The mixer of the transmitter and the mixer of the receiver share a local oscillator.

A low-cost local oscillator of a spectrum analyzer, in which linearity is corrected during the frequency scanning of a voltage-controlled oscillator.

A selection component forwards a signal output by the first voltage controlled oscillator or a signal output by the second voltage controlled oscillator to the second local oscillator output.

LO-switch is further connected in series to a current source.

A local oscillator used for communication equipment or a double superheterodyne tuner.

The control unit is preferably adapted to adjust the operation of a local oscillator.

A virtual rather than actual local oscillator is reliably implemented without mismatch.

The system includes a local oscillator (112), a mixer (113) and a processor (1 16).

The differential LO-switch is further connected in series to a current source.