Solid-State Devices & Circuits

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Presentation transcript:

Solid-State Devices & Circuits ECE 342 Solid-State Devices & Circuits 10. MOS Amplifiers Jose E. Schutt-Aine Electrical & Computer Engineering University of Illinois jschutt@emlab.uiuc.edu

Biasing of MOS Transistors Bias Characteristics Operation in saturation region Stable and predictable drain current

Two-Supply MOS Bias RG provides DC ground at gate and high input resistance to signal source.

Single-Supply MOS Bias Choose R1 and R2 to fix VG Choose RS and R2 to fix VS VGS determines ID Choose RD to fix VD

Bias with Feedback Resistor Negative feedback (degeneration) provided by RG

Common Source MOSFET Amplifier Bias is to keep MOS in saturation region

Common Source MOSFET Amplifier Small-Signal Equivalent Circuit for MOS (device only) Which leads to

MOSFET Output Impedance To calculate rds, account for l rds, accounts for channel width modulation resistance.

Midband Frequency Gain Incremental model for complete amplifier

Example In the circuit shown, VT=1 V, l=0, mCoxW/2L=0.1 mA/V2. Select RD and R1 to result in midband voltage gain of –4 and VDSQ=7 V.

Example (Cont’)

Example For the circuit shown, k=75 mA/V2, VT=1 V, l=0 Find VDQ, VSQ Find the midband gain

Example (Cont’) reject since voltage drop across RD will be too large

Example (Cont’)

MOS Body Effect The threshold voltage VT The body effect Depends on equilibrium potential Controlled by inversion in channel The body effect VT varies with bias between source and body Leads to modulation of VT

Body Effect Fermi potential of material Body bias coefficient Potential on substrate affects threshold voltage Fermi potential of material Body bias coefficient

Body Effect – (Con’t) Define gmb as the body transconductance Can show that

Source Follower Configuration Since source is not tied to the substrate, we need to model the body effect. Note: substrate is always tied to ground.

Source Follower

Source Follower

Source Follower Neglecting GL and gds (since they are small) This value is close to 1 Output impedance of source follower Internal output impedance

Common Gate Amplifier Circuit Small-Signal Model

Common Gate Amplifier Common Gate (CG) CG amplifier is non-inverting CG amplifier has low input impedance CG is unity current-gain amplifier

MOS Topologies - Ideal CS CG SF 1 Avo Rin Rout