Basic Principles of Sinusoidal Oscillators - NCKU

Sine-Wave Sh

Nonlinear-amplification meth

 For various input values,
values can be calculated

Transfer curve can be o

V

RC _ vO

(Sine w

vi Q1 R

(Triangular wave)

I

Prof. Tai-Haur Kuo - VE

12

haper (Cont.)

hod
their corresponding output

obtained and is similar to

VCC
O  RC

wave)

Q2
R

I

VEE Electronics(3), 2012

- 51

Sine-Wave Sh

Breakpoint method
 Piecewise linear transferc
 Low-valued R is assumed

V1  Vin  V1  Vout  Vin
V1  Vin  V2  D2 is on (volta

 V0  V1  VD  (Vin  VD  V

V2  Vin  D1 is on  limi

Prof. Tai-Haur Kuo 12

haper (Cont.)

curve
d V1 and V2 are constant

age drop VD )

V1 ) R5
R5  R
4

it V0 to V2  VD

- 52 Electronics(3), 2012

Sine-Wave Sh

V

D1 R1
D2 R5  V2

In R 4 R2 V
 V1 V
R3 V
V
D3 R5 R3
D4  V1 12
R3
out  V2

R1

V

Prof. Tai-Haur Kuo

haper (Cont.)

In
out
15

V2
V1 2 4
V1 0
V2

3

- 53 Electronics(3), 2012

Precision Rec

Precision half-wave rectifier

" Superdiode "

Vi 

_ VA

VO

R

An alternate circuit

R1 D2 R2
Vi
_ D1 VO



Prof. Tai-Haur Kuo 12

ctifier Circuits

--- “superdiode”

VO

1
1
0 Vi

VO

1 0 Vi
1
Electronics(3), 2012
- 54

Precision Rectifie

 Application：Measure AC

R2

D2

R1 _ D1
Vi
A 1



Average V1  VP R2 ；whe
π R1 amp

sinu

Prof. Tai-Haur Kuo 12

er Circuits (Cont.)

C voltages

C

R4 VO

R3 _
A2

V1 

ere Vp is the peak
plitude of an input

usoid

- 55 Electronics(3), 2012

Precision Rectifie

If 1  ωmin ；ωmin
R4C freq

 V2   VP R2 R4
π R1 R3

Prof. Tai-Haur Kuo 12

er Circuits (Cont.)

n is the lowest expected
quency of the input sine wave

- 56 Electronics(3), 2012

Precision Full-W

A DA A

 1 B DB B

RL

C

Prof. Tai-Haur Kuo 12

Wave Rectifiers

or

- 57 Electronics(3), 2012

Precision Full-Wave

Vi A _ D1 C
A2
R1 E

R2

_ D2
A1
F
R

Prof. Tai-Haur Kuo 12

e Rectifiers (Cont.)

C VO
P Vi
VO

RL

- 58 Electronics(3), 2012

With load Peak R

 Super diode
vi
- 
_

buffered R
D2

 _ D
v- i A1 12

Prof. Tai-Haur Kuo

Rectifier

RL 

C v O
-
R

_ 
D1 A2 v
- O
C

- 59 Electronics(3), 2012