| 摘要 |
<p>1,088,251. Transistor amplifying circuits. MARCONI CO. Ltd. Oct. 28, 1965 [Jan. 6, 1965], No. 654/65. Heading H3T. A transistor amplifier has two negative feedback loops of which one is a current feedback loop for stabilizing gain and the other is a voltage feedback loop including an impedance 6 dimensioned to match the output impedance of the circuit to the impedance of the load 5. The current and voltage feedback loops comprise transformer 3, and resistor 6 and transformer 8, respectively. Transformer 8 may be omitted (Fig. 1, not shown), resistor 6 being directly connected to the base of transistor 2, although its presence permits a larger resistor 6 and hence reduces the loss therein. Transformers 3 and 8 may be replaced by a single three-winding transformer (Fig. 3, not shown), the windings being both of the primaries and one of the secondaries of transformers 3, 8. Capacitor 10 compensates for phase shift in transistor 2. A plurality of output transistors 2 may be connected in parallel.</p> |
