Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

How to draw the small signal equivalent model of a circuit

Status
Not open for further replies.

anandmakate

Newbie level 6
Joined
Apr 2, 2008
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,347
Hello everyone,
Could you please tell me how to draw the small signal equivalent ofa given mos circuit.Please give me at least the link which provides me the complete guidance regarding it. Any help is greatly appreciated.

Thanks
 

Electronica

Full Member level 2
Joined
Jul 17, 2006
Messages
121
Helped
10
Reputation
20
Reaction score
3
Trophy points
1,298
Activity points
1,739
cosider either the pi or t diagram of a device
 

anandmakate

Newbie level 6
Joined
Apr 2, 2008
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,347
Re: How to draw the small signal equivalent model of a circu

oh ..thanks for the valuable reply....could you please illustrate with an example...
 

kiprono

Advanced Member level 4
Joined
Nov 18, 2005
Messages
114
Helped
19
Reputation
38
Reaction score
4
Trophy points
1,298
Location
Nairobi
Activity points
1,842
Re: How to draw the small signal equivalent model of a circu

In a two-terminal network, the terminal voltage is related to the terminal current by the impedance Z =V/I. In a four-terminal network, if each terminal pair (or port) is connected separately to another circuit as in Fig. 1, the four variables i1, i2, v1, and v2 are related by two equations called the terminal characteristics. These two equations, plus the terminal characteristics of the connected circuits, provide
the necessary and sufficient number of equations to solve for the four variables.

The terminal characteristics of a two-port network, having linear elements and dependent sources, may be written in the s-domain using z-parameters as shown in eqt. (1).

The coefficients Zij have the dimension of impedance and are called the Z-parameters of the network. The Z-parameters are also called open-circuit impedance parameters since they may be measured at one terminal while the other terminal is open. They are given in eqt. (2)
 

kiprono

Advanced Member level 4
Joined
Nov 18, 2005
Messages
114
Helped
19
Reputation
38
Reaction score
4
Trophy points
1,298
Location
Nairobi
Activity points
1,842
Re: How to draw the small signal equivalent model of a circu

h-parameters
Some two-port circuits or electronic devices are best characterized by the terminal equations in eqt. (3), where the hij coefficients are called the hybrid parameters, or h-parameters.
Fig.2 shows a simple model of a bipolar junction transistor in its linear region of operation. By inspection, the terminal characteristics of Fig. 2 are given in eqt. (4).
By comparing (3) and (4) gives eqt. (5).
 

Naveed Alam

Full Member level 5
Joined
Jan 6, 2006
Messages
287
Helped
16
Reputation
34
Reaction score
3
Trophy points
1,298
Activity points
3,250
Re: How to draw the small signal equivalent model of a circu

any electronic circuit book will teach u this.
PI, HYBRID are used mainly.


Naveed
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top