Abstract: A high-voltage bi-directional analog switch is implemented using a pair of MOS depletion type transistors having their sources connected together and having their gates connected together. The drains constitute the high voltage input port and the high voltage output port. The switch conducts so long as the voltage on the common gate connection relative to the voltage on the common source connection is more positive that the pinch-off voltage. The source-to-gate voltages are controlled by a means including an enhancement mode transistor. Voltage level shift means are provided to shift low level logic signals to a sufficiently high level to control conductance through said enhancement mode transistor. The source of voltage rails need not provide two high voltages but at most only a single high voltage level is required.

Abstract: In this successive approximation analog-to-digital converter non-precise impedance elements are used in a circuit which provides successive analog step values that approximate a non-binary series in which (above a certain minimum) each term is smaller than the sum of the preceding series terms. The actual values of the analog quantities that are produced by the corresponding individual impedance elements are stored in digital format in a memory. These quantities are measured and stored with an accuracy which exceeds the accuracy expected for the final operation of the system. At each conversion step, the unknown analog input is compared with the sum of a pair of step values, the smaller of which is greater than the maximum expected comparator error. An acceptable comparator output may be obtained before the comparator has completely settled.

Abstract: A monolithic switching circuit has a junction field-effect transistor controlled through a capacitive diode and a small field-effect transistor. The physical structure of the switch includes a junction field-effect transistor with a gate region connected to one side of a diode and to the gate of another small field-effect transistor having the source thereof connected to or comprising the other side of the diode and the drain thereof connected to a control terminal.