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Micrel Inc.
Functional Diagram
MICRF221
UHF
DOWNCOVERTER
CONTROL
LOGIC
DESENSE
AGC
CONTROL
CAGC
MIXER
LNA
MIXER
-f
f
IF AMP
DETECTOR
RSSI
RSSI
i
f LO
IMAGE
REJECT
FILTER
CONTROL
LOGIC
PROGRAMMABLE
FILTER
OOK
DEMODULATOR
SYNTHESIZER
SLICER
SLEEP
OSCILLATOR
SLEEP
TIMER
BITCHECK
WAKE-UP
DO'
DO
AUTOPOLL
SQUELCH
CTH
DO
REFERENCE
OSCILLATOR
DO'
CONTROL
LOGIC
CONTROL
LOGIC
SLICE
LEVEL
REFERENCE
AND CONTROL
Figure 3. Simplified Block Diagram
Functional Description
The simplified block diagram, shown in Figure 3,
illustrates the basic structure of the MICRF221
receiver. It is made of four sub-blocks:
pre-selector band-pass filter.
Receiver Operation
UHF Downconverter
?
?
?
?
UHF Down-converter
OOK Demodulator
Reference and Control logic
Auto-poll circuitry.
The UHF down-converter has six components: LNA,
mixers, synthesizer, image reject filter, band pass filter
and IF amp.
LNA
The RF input signal is AC-coupled into the gate circuit
Outside the device, the MICRF221 receiver requires
just three components to operate: two capacitors
(CTH, and CAGC) and the reference frequency device
(usually a quartz crystal). An additional five
components are used to improve performance: a
power supply decoupling capacitor, two components
for the matching network, and two components for the
of the grounded source LNA input stage. The LNA is a
Cascoded NMOS amplifier. The amplified RF signal is
then fed to the RF ports of two double balanced
mixers.
October 2008
7
M9999-100108
(408) 955-1690
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