CHAPTER 3:
(i) IMPACT OF SOURCE AND LOAD RESISTANCES
(ii) MULTIPLE STAGES
Assoc. Prof. Loan PHAM-NGUYEN
September, 2024
Impact of Rs and Rload
◻Introduction
◻Input and output impedances
◻Solutions
2
4 types of amplifier
3
𝑢𝑜 =
𝐴𝑑𝑢𝑖 𝑑
𝑖𝑜 =
𝑆𝑑𝑢𝑖 𝑑
𝑖0 = 𝑘𝑙𝑖−𝑖𝑛 =
𝑆𝑑𝑢𝑖𝑑
𝑢0 = 𝑖−𝑖𝑛 𝑍 =
𝐴𝑑𝑢𝑖 𝑑
𝑢𝑖𝑑 𝑢𝑜𝑢𝑖𝑑 𝑖𝑜
𝑢𝑖𝑑 𝑢𝑜𝑢𝑖𝑑 𝑖𝑜
𝑖−𝑖𝑛
𝑖−𝑖𝑛
Signal sources
◻2 alternative representation of signal sources
◻Two-port network or four-terminal network or
quadripole
THEVENIN signal source NORTON signal source
4
Two-port models of 4 amplifiers
Voltage amplifier
5
Gm amplifier
Current amplifier
Ra amplifier