Abstract: A monolithic power amplifier system is described which comprises a biasing system 50, transconductance amplifier circuit 42 and a transimpedance amplifier circuit 44 biasing network 50 is operable to generate a bias voltage which is used by the transimpedance amplifier 44. The transimpedance amplifier 44 receives an input current signal from the transconductance amplifier 42. The changes in the input current are communicated to a pull-up transistor 184 and a pull-down transistor 190 which drive an output voltage VOUT at sufficient levels to power the cathode of an electron gun of a video system.

Abstract: A circuit (10) and method for reducing a tilt of a video picture on a color monitor includes a circuit (30) for providing an output signal for controlling the vertical position of the scanning beam that includes an MOS transistor (60) having substantially zero current flow in its gate element, and connected to control the magnitude of the output drive signal. In a preferred embodiment, a LinBiCMOS semiconductor manufacturing process is employed to fabricate a plurality of bipolar transistors connected to provide a control voltage on the gate of the MOS transistor (60), which may conveniently be an NMOS device. The bipolar transistors may be connected to form a translinear cell (11) connected to receive a signal (17) related to a horizontal synchronizing signal and to provide a voltage output to the gate of the MOS transistor (60) in response thereto.

Abstract: An amplifier (10) and method for controlling a saturation level of a color video signal has a circuit (33) connected to sum respective individual input color video signals to provide a summed output video signal (34). A first amplifier (14) receives one of the individual color video signals (R) as an input and produces an amplified individual color video signal output (15). A second amplifier (30) receives the summed output video signal (34) and produces a reference output signal (35), connected to be added to the amplified individual color video signal output (15). A user adjustable color saturation control circuit (25) controls a gain of the second amplifier (30), and inversely controls a gain of the first amplifier (14). In one embodiment, a contrast control circuit (20) is connected to control the gain of the first amplifier (14) with the user adjustable color saturation control circuit (25) being connected to the contrast control circuit (20) to control the gain of the first amplifier (14).

Abstract: A BiCMOS output driver for a transceiver circuit has a pull-up/pull-down circuit with CMOS transistors supplying base current to bipolar pull-up/pull-down transistors. In its quiescent state, the CMOS transistors draw no current. A current mirror circuit comprising a pair of bipolar transistors sized to be a fraction of the pull-up/pull-down transistors is coupled between the input and output of the pull-up/pull-down circuit to prevent exceeding a predetermined current. A speed up circuit comprising CMOS transistors coupled between ground and the base of the bipolar pull-up/pull-down transistors to speed up the shut off of the transistors.