| 摘要 |
1,240,137. Transistor amplifying circuits. RCA CORPORATION". 6 Dec., 1968 [8 Dec., 1967], No. 57998/68. Heading H3T. [Also in Divisions G2-G3] A stabilized current source for biasing a transistor comprises a resistor having a value dependent on environmental temperature and a predetermined number of forward biased semiconductor junction voltage drops serially coupled between one end of the resistor and a point of reference voltage, the variation with temperature of the voltage drops compensating the current variations caused by variation of the resistor, whose other end is connected to a voltage supply point. In Fig. 4, the resistor comprises the circuit connected between 12, 20, the voltage drops comprise a number of rectifier-connected transistors 22, 24-24n, the reference voltage is ground terminal 14, and the whole arrangement is used to bias a transistor 11 for amplifying signals applied thereto via a capacitor 19 and a terminal 21. Fig. 5 is similar to Fig. 4, except that the voltage drops are provided by a transistor feedback stage 200 of the type disclosed in Specification 1,229,274. The components all form part of an integrated circuit and a discussion is given for a monolithic silicon structure of the method and equations for determining the number of voltage drops. An avalanche diode 334 provides compensation for variations of the voltage supply 12. The remaining members of the circuit between points 12, 20 regulate the current through the diode 334 to clearly define its reverse-breakdown voltage and the charges thereof due to temperature variations. The circuit between points 12, 20 may be replaced by a single temperature responsive resistor, Figs. 1 and 2 (not shown). |
