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NJW1124

Voice Switched Speakerphone circuit

Japan Radio Corporation  

NJW1124

4.Receive Amplifier

Receive Amplifier is an operational Amplifier receiving the signal from satellite unit.

Fig.4 shows Block Diagram of Mic.Amp Block Non-inverting input keeps reference voltage inside.

Receive Amp is used as inverting amplifier. The Gain should be 40dB or less.

Receive Amplifier doesn’t equip Mute function.

Rx Attenuator

Receive

Amplifier

VREF

FO

R13

5.1k

FI

R14 C19

5.1k 100n

Fig.4 Receive.Amp Block.(0dB Application)

Recive In

Outside parts

C19

R１4

R１3

Function

DC decoupling

Gain Setting

recommend value

100nF～10µF

3kΩ～300kΩ

Detail

-

Gv=R13/R14

Input impedance＝R14

Memo

Shape HPF : fc=1/(2π×C19×R14)

Recommend gain less than :40dB

Large resistance value may cause oscillating.

– 16 –

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