Chương 8: Compound Configuration potx

Compound configuration Compound configuration  Coupling Coupling  Cascode connection Cascode connection  Darlington connection Darlington connection  Feedback connection Feedback connection Coupling Coupling  Direct coupling Direct coupling • IC IC  Capacitor Capacitor • Discrete circuits Discrete circuits  Transformer Transformer Capacitor coupling Capacitor coupling  Signal from previous Signal from previous stage goes to the next stage goes to the next stage through a stage through a capacitor capacitor  Advantages: Advantages: • DC separated between DC separated between stages stages • Large capacitance to Large capacitance to reduce distortion reduce distortion  Disadvantages: Disadvantages: • Large size Large size • Affect low frequency Affect low frequency  Use in discrete circuits Use in discrete circuits Direct coupling Direct coupling  Signal from Signal from previous stage previous stage goes to the next goes to the next stage directly stage directly  Advantages: Advantages: • No power loss No power loss • Not affect Not affect frequency response frequency response  Disadvantage: Disadvantage: • Influence of DC bias Influence of DC bias between stages between stages  Use in IC Use in IC Cascode connection Cascode connection  CE and CB CE and CB transistor transistor connected directly connected directly  CE stage with small CE stage with small negative gain => negative gain => small Miller small Miller capacitance capacitance  Use in high Use in high frequency amplifier frequency amplifier Cascode connection Cascode connection  Practical Cascode Practical Cascode connection: connection: A A V V 1 1 = -1 => input = -1 => input Miller capacitance Miller capacitance small small A A V V 2 2 large => total gain large => total gain large large Darlington connection Darlington connection  Two transistors of Two transistors of the same type, the same type, working as a single working as a single transistor transistor  Current gain Current gain coefficience is very coefficience is very large large Darlington connection Darlington connection Feedback Feedback  Similar to Darlington Similar to Darlington connection connection  Two transistors of Two transistors of different type, working different type, working as a single transistor as a single transistor pnp pnp  Current gain coefficience Current gain coefficience is very large is very large Mạch ghép Mạch ghép Mạch nguồn dòng Mạch nguồn dòng Bộ phận cấp dòng điện, Bộ phận cấp dòng điện, mắc song song với mắc song song với điện trở R, được gọi là điện trở R, được gọi là nội trở của nguồn nội trở của nguồn Nguồn dòng điện lý Nguồn dòng điện lý tưởng khi R = tưởng khi R = ∞ ∞ , và , và cung cấp một dòng cung cấp một dòng điện là hằng số điện là hằng số [...]... hiệu vào 2 đầu ngược pha: Tín hiệu vào 2 đầu cùng pha: (re+ 2(β+1+RE) Nhận xét: Ad=βRC/2re Ac = βRC/ • Tín hiệu vào ngược pha: hệ số khuếch đại lớn • Tín hiệu vào cùng pha: hệ số khuếch đại nhỏ  BT: chương 12: 1, 6, 11, 12, 15, 19, 21, 24, 26, 30 . Compound configuration Compound configuration  Coupling Coupling  Cascode connection Cascode connection  Darlington. hệ số khuếch đại nhỏ Tín hiệu vào cùng pha: hệ số khuếch đại nhỏ  BT: chương 12: 1, 6, 11, 12, 15, 19, 21, 24, 26, 30 BT: chương 12: 1, 6, 11, 12, 15, 19, 21, 24, 26, 30