MC13145FTA 데이터 시트보기 (PDF) - LANSDALE Semiconductor Inc.

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MC13145FTA

UHF Wideband Receiver Subsystem (LNA, Mixer, VCO, rescaler, IF Subsystem, Coiless Detector)

LANSDALE Semiconductor Inc. 

ML13145

LANSDALE Semiconductor, Inc.

Figure 4. IF Amplifier Functional Diagram

39

IF Dec1

38

IF In

40

IF Dec2

41

IF Out

RSSI

Σ

Pin

Symbol/Type

Description

43

VCC

See Figure 5.

44

Lim In

45, 46

7

Lim Dec1,

Lim Dec2

RSSI

Description

VCC, Positive Supply Voltage

Limiting Amplifier Input

Limiting amplifier input source impedance is 330 Ω.

This amplifier has 84 dB of gain with 3.0 dB

bandwidth of 40 MHz; this enables the IF and

limiting ampliers chain to hard limit on noise.

If Decoupling

These pins are decoupled to VCC to provide stable

operation of the 2nd IF limiting amplifier.

RSSI

The RSSI circuitry in the 2nd, 3rd, & 4th amplifier

stages outputs a current when the output of the

previous stage enters limiting. The net result is a

RSSI current which represents the logarithm of the

IF input voltage. An external resistor to ground is

used to provide a voltage output.

Figure 5. Limiter Amplifier Functional Diagram

7

RSSI

45

Lim Dec1

44

Lim In

46

Lim Dec2

Σ

Lim+

Lim–

Demod

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