Abstract: A digital-to-analog converter comprising an IC switch module providing four switch transistors and associated switch-control buffering circuitry. The emitter areas of the switch transistors are binarily weighted to provide equal current densities. The IC substrate also is formed with a fifth transistor to serve as a reference transistor for adjusting the supply voltage as necessary to maintain constant current through the switch transistors. To construct a digital-to-analog converter having a high bit resolution, a number of such "quad" switch modules may be combined, for example in a printed circuit card assembly including a thin-film resistor module providing binarily-weighted resistors on a glass substrate to set the current levels through the switch transistors.

Abstract: A digital-to-analog converter having means to suppress the transient signals present at the output of the converter in response to a clock pulse synchronized with the transient signal. The clock pulse applies a forward bias to a pair of series-connected diodes which clamp the digital-to-analog converter output to ground. An integrator is connected to the converter output terminal to stabilize and filter the output signal while the terminal is clamped to ground.

Abstract: A digital-to-analog converter comprising an IC switch module providing four switch transistors and associated switch-control buffering circuitry. The emitter areas of the switch transistors are binarily weighted to provide equal current densities. The IC substrate also is formed with a fifth transistor to serve as a reference transistor for adjusting the supply voltage as necessary to maintain constant current through the switch transistors. To construct a digital-to-analog converter having a high bit resolution, a number of such "quad" switch modules may be combined, for example in a printed circuit card assembly including a thin-film resistor module providing binarily-weighted resistors on a glass substrate to set the current levels through the switch transistors.

Abstract: A digital-to-analog converter utilizing a set of high-speed current switches each comprising a buffer transistor and a switching transistor interconnected with a common resistor in such a fashion that the buffer transistor in the normal "off" state supplies the common resistor with a current of predetermined magnitude to bias the switching transistor to cut-off; a control pulse coupled through an input diode cuts off the buffer transistor, the bias at the switching transistor is thereby eliminated, and the switching transistor immediately conducts.

Abstract: A digital-to-analog converter the output circuit of which comprises a set of switching transistors arranged as current generators. The currents through the switching transistors are maintained constant by means of a supply voltage adjusting circuit comprising a separate reference transistor matched to one of the switching transistors and energized by the same voltage supply lines as the switching transistors. The supply voltage adjusting circuit includes an operational amplifier which senses the collector current of the reference transistor, and adjusts the supply voltage so as to maintain that collector current constant. This automatic adjustment of the supply voltage also maintains the current through the switching transistors constant.

Abstract: A digital-to-analog converter comprising an IC switch module providing four switch transistors and associated switch-control buffering circuitry. The emitter areas of the switch transistors are binarily weighted to provide equal current densities. The IC substrate also is formed with a fifth transistor to serve as a reference transistor for adjusting the supply voltage as necessary to maintain constant current through the switch transistors. To construct a digital-to-analog converter having a high bit resolution, a number of such "quad" switch modules may be combined, for example in a printed circuit card assembly including a thin-film resistor module providing binarily-weighted resistors on a glass substrate to set the current levels through the switch transistors.