Methods for analyzing circuit distortion based on contributions from separate circuit elements are presented. Local approximations that do not require high-order derivatives of device models are developed near an operating point for calculating distortion summaries including compression summaries and second-order intermodulation (IM2) distortion summaries.

The present invention provides a distortion precompensator and method of compensating for distortion in a transmission medium and a transmitter employing the same. In one embodiment, the distortion precompensator includes a controller, associated with a transmitter, that employs a predetermined precompensation signal. The distortion precompensator also includes an injector that injects a predetermined precompensation value as a function of the precompensation signal into a waveform propagating a...

An optical apparatus for an image forming apparatus has a laser emission device. The laser emission device has first and second light emission units for emitting first and second laser beams. The first and second laser beams emitted by the light emission units are collimated by a collimator lens, and their radii are regulated by a stop. These laser beams are scanned by a scanning mirror on a photosensitive drum in the main scan direction. Distortion of the scanned first and second laser beams is...

A current mirror implemented preferably in MOS technology provides low total harmonic distortion and high output impedance and maintains the input signal within one Vgs of the supply voltage source. For an input signal having DC and AC components I and i, a constant curent of 2I is fed to the input terminal. A transistor couples the input terminal to the output terminal. The difference of the constant current and the input current is the output current I-i which passes through the transistor to ...

This disclosure relates to a technique for estimating the characteristics of a propagation channel by processing a cyclostationary signal which has passed through it. The technique extends to the use of this estimate to reduce the impact of the channel distortion on the recovered signal. Unique features of this technique include its ability to function even when strong interference is present with the cyclostationary signal of interest.

The low distortion drive amplifier of the present invention uses an emitter follower circuit to drive a low impedance load such as a transmission line. A constant current source is connected to the emitter terminal of the emitter follower transistor to provide a constant current through the emitter of the emitter follower circuit. Compensation circuitry is provided to offset any load current that is diverted from the emitter follower circuit to the load thereby insuring a constant current throug...

In a circuit arrangement for correcting a raster distortion in a cathode ray tube, at least one vertical perforated, index strip of a sensor is arranged at a corresponding margin of a picture producing screen of the cathode ray tube. An index signal that is indicative when the electron beam passes the index strip is generated. The index signal is coupled through an enclosure of the cathode ray tube in a nonconductive manner to a second electrode that is located outside the enclosure. A comparato...

An FM detection circuit utilizes a first multiplier and phase shift circuit to demodulate an FM signal. The output signal also contains harmonic distortion as a result of the demodulation process. A gain control circuit is included to provide a first gain control signal to the first multiplier which adjusts the magnitude of the output signal of the FM detection circuit in such a manner as to substantially eliminate the harmonic distortion. The gain control circuit uses a second multiplier to gen...

Elongate extruded sections of vinyl siding, having a top edge portion, which is intended to be hidden in use behind the bottom edge of an immediately higher section of siding, wherein the top edge portion is slit crosswise at a plurality of spaced apart locations, permitting freer expansion and contraction of the exposed portion of the siding with changes in temperature.

For a multi-scan display having a single S-capacitor incorporated, a S-distortion correcting circuit capable of correcting S distortion at any horizontal scanning frequency. The S-distortion correcting circuit comprises a first circuitry for cancelling out horizontal S-distortion making appearance in dependence on geometrical relation between scanning locus of an electron beam and the plane of screen of a picture tube, a second circuitry for cancelling out horizontal S-distortion generated in a ...