Slide điện tử từ trường lecture 6 bjt circuits

Lecture 06 BJT Circuits Microelectronic Circuit by meiling CHEN CuuDuongThanCong.com https://fb.com/tailieudientucntt topics • Small-signal operation – Hybrid π model – T-model – Early Effect • Single-stage BJT amplifiers – Amplifier basic structure – CE Amplifier – CB Amplifier – CC Amplifier Microelectronic Circuit by meiling CHEN CuuDuongThanCong.com https://fb.com/tailieudientucntt DC analysis Small signal IC = I S e DC analysis IE = IC IB = IC VBE VT α β VC = VCE = VCC − I C RC Microelectronic Circuit by meiling CHEN CuuDuongThanCong.com https://fb.com/tailieudientucntt iC = I S e vBE VT = ISe ( VBE +vbe ) VT vbe iC ≈ I C (1 + ) ← if VT VBE VT = ISe e vbe VT = ICe vbe VT vbe 1) Ro high Ai High(>1) 40 Microelectronic Circuit by meiling CHEN CuuDuongThanCong.com https://fb.com/tailieudientucntt 41 Microelectronic Circuit by meiling CHEN CuuDuongThanCong.com https://fb.com/tailieudientucntt Ri low Av Low (