19

LT1228

+

–

A3

LT1006

LT1228 • TA20

+

–

CFA

100

Ω

10k

RF INPUT

25MHz

300

Ω

–15V

15V

+

–

470

Ω

10

Ω

0.01µF

10k

0.01µF

15V

–15V

4pF

10k

100k

AMPLITUDE

ADJUST

10k

4.7k

–15V

LT1004

1.2V

10k

OUTPUT

1N4148’s

COUPLE THERMALLY

3

2

7

5

1

8

4

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

S

APPLICATI

TYPICAL

RF AGC Amplifier (Leveling Loop)

Amplitude Modulator

LT1228 • TA22

–

+

1k

–

+

10k

–5V

3

5V

7

5

4

1

8

6

0dBm(230mV) AT

MODULATION = 0V

CFA

750

Ω

750

Ω

+

4.7

µF

MODULATION

INPUT

4.7

µF

CARRIER

INPUT

30mV

2

Inverting Amplifier with DC Output Less Than 5mV

LT1228 • TA21

–

+

+

100

µF

–

+

R5

V –

3

2

V+

7

5

4

1

8

6

CFA

1k

1k

BW = 30Hz TO 20MHz

INCLUDES DC