Microwatt CCG Logic Circuit With JFET Feedback Loop
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Fig. 1 shows a CCG (Current-Controlled Gate) logic circuit with an added JFET feedback loop. The operation of the CCG circuit alone is described in detail in [*]. When the CCG logic circuit is designed to operate in a low microwatt power region (100-150 microwatts), a very high value resistor, connected to the base of transistor T5, is required. The implementation of such high valued semiconductor resistors (150-200 kilohm) on VLSI chips is impractical. The use of the JFET feedback loop, formed by the device T6 in Fig. 1, provides a solution to this problem. An additional improvement to the CCG circuit described in [*] is made in the circuit shown in Fig. 1. Note that the emitter and collector of device T3, which provide dynamic capacitive coupling, are shorted together instead of shorting the emitter and base.