5/27/2018

1

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[1]PEMICBGU

Analog Electronic Circuits

Prof. Mor M. Peretz

The Center for Power Electronics and Mixed-Signal IC

Department of Electrical and Computer Engineering

Ben-Gurion University of the Negev, ISRAEL

Emails: morp@bgu.ac.il

Website: http://www.ee.bgu.ac.il/~pemic

http://www.ee.bgu.ac.il/~analog

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[2]PEMICBGU

Lesson #7

Outline• Comparators

– Voltage comparator – basic characteristics

– Internal circuit

– Propagation time and overdrive

– Output stage

• Basic applications

– Level detection, window, counter, PWM, ON-OFF control

• Schmitt trigger

– Inverting and noninverting

– Single supply

• Advanced applications

– Oscillators

5/27/2018

2

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[3]PEMICBGU

Comparator

-

+

VOUT

Vin [V]

Vout [V]

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[4]PEMICBGU

Internal circuit

Simple differentialLM339 (TI)

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[5]PEMICBGU

Internal circuit

Latched output

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

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Propagation time and overdrive

(TI)

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[7]PEMICBGU

Output stage

Push-pull Open-drain

(Open-Collector)

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

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Basic operation

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[9]PEMICBGU

Applications –basic

S. Franco

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[10]PEMICBGU

Applications –basic

+-

Vv

Vp

Vin

Vin

PWM

S. Franco

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[11]PEMICBGU

Applications –basic

S. Franco

+

– K

Vref

C2

I2V2I1

Iin

V2

Vref

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[12]PEMICBGU

Comparator noise

t

[V]

VREF

VOL

VOH

Vin

t

VOL

VOH

Vout [V]

Vin

-

+

VOUT

A

VREF

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[13]PEMICBGU

Schmitt Triggers

Inverting Schmitt Trigger

Vin [V]

Vout [V]VTL VTH

VOH

VOL

t

[V]

VTL

VTH

VOL

VOH

Vin

Vout

-

+ VOUT

R1

R2

AVin

𝑉𝑇𝐻 =𝑅1

𝑅1 + 𝑅2𝑉𝑂𝐻

𝑉𝑇𝐿 =𝑅1

𝑅1 + 𝑅2𝑉𝑂𝐿

VTC with hysteresis

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

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Non-inverting Schmitt Trigger

t

[V]

VTL

VTH

VOL

VOH

Vin

Vout

Vin [V]

Vout [V]VTL VTH

VOH

VOL

-

+ VOUT

R1 R2

A

Vin

𝑉𝑇𝐻 = −𝑅1𝑅2

𝑉𝑂𝐿

𝑉𝑇𝐿 = −𝑅1𝑅2

𝑉𝑂𝐻

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[15]PEMICBGU

Single-supply Schmitt Trigger

-

+ VOUT

R1 R3

A

R2

VCC

Vin

𝑉𝑇𝐻 =𝑅1

𝑅1 + 𝑅2||𝑅3𝑉𝐶𝐶

𝑉𝑇𝐿 =𝑅1||𝑅3

𝑅2 + 𝑅1||𝑅3𝑉𝐶𝐶

Vin [V]

Vout [V]VTL VTH

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[16]PEMICBGU

Single-supply Schmitt Trigger

𝑅1𝑅2

=𝑉𝑇𝐻 − 𝑉𝑇𝐿

𝑉𝐶𝐶

-

+ VOUT

R3 R4

A

Vin

R1

R2

VCC

-

+ VOUT

R3 R4

A

Vin

R1

R2

VCC

RD

RD for open-drain

𝑅3𝑅4

=𝑉𝐶𝐶 − 𝑉𝑇𝐿

𝑉𝑇𝐻

Vin [V]

Vout [V]VTL VTH

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[17]PEMICBGU

Oscillators

𝑉𝑇𝐻 =𝑅1

𝑅1 + 𝑅2𝑉𝑂𝐻

𝑉𝑇𝐿 =𝑅1

𝑅1 + 𝑅2𝑉𝑂𝐿

𝑉 𝑡 = 𝑉∞ − 𝑉∞ − 𝑉0 𝑒−𝑡𝜏

t

[V]

VTL

VTH

VOL

VOH T1 T2 𝑇1:

𝑉∞ = 𝑉𝐸𝐸𝑉0 = 𝑉𝑇𝐻𝑉 𝑡 =𝑉𝑇𝐿

𝑇2:𝑉∞ = 𝑉𝐶𝐶𝑉0 = 𝑉𝑇𝐿𝑉 𝑡 =𝑉𝑇𝐻

-

+ VOUT

R1 R2

A

RVCC

C

VEE

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[18]PEMICBGU

Oscillators

programmed on/off

-

+ VOUT

R1 R2

A

RD1VCC

C

VEE

RD2

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[19]PEMICBGU

Voltage-Controlled Oscillator

VCO

-

+ VOUT

R1 R2

A

RVCC

C

VEE

VinR

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[20]PEMICBGU

Oscillator

Single supply

-

+ VOUT

R1 R2

A

RVCC

C

VCC

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[21]PEMICBGU

Voltage-Controlled Oscillator

Programmable freq

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

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Σ-Δ ADC

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[23]PEMICBGU

Phase-Locked-Loop

PLL

Phase

ComparatorLPF VCO

Freq.

Divider1/s

1/s fin

(fref) fout

foutƟout

Ɵin

VD Ve

VD

ƟD

VCC

π 2π

VCC/2XO

R SRFF

Q

QSET

CLR

S

R

fout

Ve

fmax

fmin

Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[24]PEMICBGU

5/27/2018

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Prof. Mor M. Peretz Analog Electronic Circuits 361-1-3671

THE CENTER FOR POWER ELECTRONICS AND MIXED-SIGNAL IC, BEN-GURION UNIVERSITY

[25]PEMICBGU