麻省理工 电路和电子学 公开课 Circuits and Electronics, MIT 课程笔记 - lecture11
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
Small signal notation
v A = V A + v a
total operating
small o
O v +
I Graphical view
(using transfer function) Array
I
II Mathematical view
v⋅
i
V
I
III The Small Signal Circuit View We can derive small circuit equivalent
models for our devices, and thereby conduct small signal analysis directly on circuits
1
Small Signal Circuit Analysis 1Find operating point using DC bias inputs using large signal model.
Small Signal Models
MOSFET
A
)2T V −
Small Signal Models
MOSFET
A
)2T V −)gs
T v V −v gs !
DC Supply V S
B
S
V s
I i S
⋅=
Similarly, R
C r
I i R
R ⋅=
III The Small Signal Circuit View To find the relationship between the small signal parameters of a circuit, we can replace large signal device models with corresponding small signal device models, and then analyze the resulting small signal circuit.
Foundations: (Also see section 8.2.1 of A&L)