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MICRF104 Datasheet(PDF) 6 Page - Micrel Semiconductor

Part No. MICRF104
Description  1.8V, QwikRadio™ UHF ASK Transmitter
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF104 Datasheet(HTML) 6 Page - Micrel Semiconductor

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MICRF104
Micrel
MICRF104
6
November 8, 2001
Functional Description
The block diagram illustrates the basic structure of the RF
portion of the MICRF104.
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.
Functional Diagram
TX
Bias
Control
Varactor
Device
Antenna
Tuning
Control
Power
Amp
Buffer
VSS
ANTM
ANTP
ASK
Buffer
Prescaler
Divide
by 32
RF Transmitter
REF.OSC
PC
VDDRF
VDD
(10)
(5)
(2)
Reference
Oscillator (1)
VCO (4)
(3)
(9)
(8)
(7)
(11)
(6a)
(6b)
STBY
Reference
Bias
Phase
Detector
5V
VSS
VDDPWR
EN
Enable
Thermal
Shutdown
Logic
Driver
Bandgap
Reference
DC/DC Converter
Error
Amplifier
1.2V
SW
Oscillator
Figure 2. MICRF104 Block Diagram (RF Circuit)
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.
A PCB antenna loop coupled with a resonator and a resistor
divider network are all the components required to construct


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