Date: 27/01/2010

Bias, control and power management IC for single band satellite low noise blocks

Diodes has introduced the ZXNB4204, bias, control and power management IC for single band satellite low noise blocks (LNB) design.

The ZXNB4204 IC handles FET and mixer biasing, channel detection and control, and offers a stable power supply for added LNB functionality.

The chip provides the biasing for up to four GaAs or HEMT FETs, enabling stable control of three low noise amplifier stages and the active mixer.

The ZXNB4204 IC also protects the sensitive low noise amplifier stage against turn-on spikes and other fault conditions, by enhancing LNB performance over all operating conditions and reducing production-trimming requirements.

The chip meets all global single band LNB specifications, by using an accurate on-board voltage detector to detect and switch between horizontal and vertical linear or left and right circular polarization signals. By rejecting any unwanted signals caused by transients and other effects, the ZXNB4204 increases STB reliability by completely eliminating false switching.

A voltage regulator is also included in the ZXNB4204 both to power internal circuits and to supply additional LNB components such as the IF gain stages and local oscillator. The integration of such power management functionality enables the LNB controller to protect against overload, over temperature and installation errors.

Packaged in the 3mm x 3mm, 16-pin QFN package

For more details visit www.diodes.com.