| 摘要 |
Proposed A-class amplifier reffers to radio technologies and communication technologies and can be used for design of different circuits and chips. Aim of the invention is to increase operational stability and to reduce aliasing of amplifier. A-class amplifier (10) comprises input cascade (11), two (positive and negative polarity) pre-output cascades (12, 13) with power supplies (14A, 14B), two voltage offset control circuits (15, 16), a pair of output transistors (17, 18) connected to pre-output circuits and in collector connection to current measurement emitter resistors (19, 20) and current supply (21) connected between bases of output transistors (17, 18), characterized in that each voltage offset control circuit (15, 16) includes operational amplifier (30A, 30B) with voltage generator (31A, 31B) of given value, voltage control transistor (32A, 32B) with voltage restriction diode (33A, 33B) built in base-emitter circuit, and voltage supply (34A, 34B) of voltage control transistor (32A, 32B). |
