发明授权
- 专利标题: Single-ended and differential transistor amplifier circuits with full signal modulation compensation techniques which are technology independent
- 专利标题(中): 具有完全信号调制补偿技术的单端和差分晶体管放大器电路是技术独立的
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申请号: US80269申请日: 1993-06-21
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公开(公告)号: US5343163A公开(公告)日: 1994-08-30
- 发明人: Lloyd F. Linder , Dwight D. Birdsall
- 申请人: Lloyd F. Linder , Dwight D. Birdsall
- 申请人地址: CA Los Angeles
- 专利权人: Hughes Aircraft Company
- 当前专利权人: Hughes Aircraft Company
- 当前专利权人地址: CA Los Angeles
- 主分类号: H03F1/32
- IPC分类号: H03F1/32 ; H03F3/30 ; H03F3/45 ; H03F3/50
摘要:
A compensating transistor (Q5) is connected in series with the collector of a main transistor (Q3), and a level shifted replica (Vin+V1) of an input signal (Vin) is applied to the base of the compensating transistor (Q5) to maintain a constant voltage difference between the base and collector of the main transistor (Q3) and compensate for base width modulation .DELTA.Vce. A voltage-controlled current source (S1) is responsive to the input signal (Vin) and applies a compensating current .DELTA.Iload which is equal and opposite to the load current variation caused by a change (.DELTA.Vin) in the input voltage (Vin) to the emitter of the main transistor (Q3) to compensate for load current modulation .DELTA.Vbe. Alternatively, the compensating current can be applied to the junction of the base of the main transistor (Q3) and the emitter of pre-distortion transistor (Q4) which has a base connected to receive the input signal (Vin). Another compensating transistor (Q12) applies a current (.DELTA.Ib) which is equal and opposite to a non-linear base current variation to the emitter or collector of the main transistor (Q3) to compensate for current gain modulation .DELTA.Ib. The modulation compensation arrangements are applicable to common-collector, common-base and common emitter amplifiers in single-ended and differential configurations, and to substantially all bipolar and field-effect transistor technologies.
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