MICRF103 Ver la hoja de datos (PDF) - Micrel

Número de pieza

componentes Descripción

Fabricante

MICRF103

QwikRadio™ UHF ASK Transmitter

Micrel 

MICRF103

Functional Diagram

Micrel

STBY

VDD

VDD

Reference

Bias

(10)

TX

Bias

Control

(9)

Power

Amp

(8)

ASK

ANTP

ANTM

PC

Phase

Detector

(2)

REF.OSC

Reference

Oscillator (1)

Prescaler

÷64

(5)

VCO (4)

(3)

Buffer

(6a)

Buffer

(6b)

Antenna

Tuning

Control

(7)

Varactor

Device

(11)

VSS

Figure 2. MICRF103 Block Diagram

Functional Description

The block diagram illustrates the basic structure of the

MICRF103. Identified in the figure are the principal functional

blocks of the IC, namely the (1, 2, 3, 4, 5) UHF synthesizer,

(6a/b) Buffer, (7) Antenna tuner, (8) Power amplifier, (9) TX

bias control, (10) Reference bias and (11) Process tuner.

The UHF synthesizer generates the carrier frequency with

quadrature outputs. The in-phase signal (I) is used to drive

the PA and the quadrature signal (Q) is used to compare the

antenna signal phase for antenna tuning purpose.

The antenna tuner block senses the phase of the transmit

signal at the antenna port and controls the varactor capacitor

to tune the antenna.

The power control unit senses the antenna signal and con-

trols the PA bias current to regulate the antenna signal to the

transmit power.

The process tune circuit generates process independent bias

currents for different blocks.

Included within the IC is a differential varactor that serves as

the tuning element to insure that the transmit frequency and

antenna are aligned with the receiver over all supply and

temperature variations.

MICRF103

6

June 2002

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