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Micrel, Inc.
MICRF213
Functional Diagram
CAGC
IMAGE
REJECT
FILTER
AGC
ANT
RF
Amp
Mixer
IF
Amp
Detector
RSSI
RSSI
VDD
VSS
f LO
Mixer
–f
i
f
Control Logic
Programmable
Low Pass Filter
IF
Amp
OOK
Demodulator
DO
SEL
SEL
SQUELCH
SHDN
Synthesizer
Reference and Control
Control
Logic
DO
Control Logic
Slicing
Level
CTH
Reference
Oscillator
RO1
RO2
Crystal
Figure 1. Simplified Block Diagram
BW IF = BW IF@315MHz × ?
?
Functional Description
Figure 1. Simplified Block Diagram. It is the basic
structure of the MICRF213. It is made of three sub-
blocks; Image Rejection UHF Down-converter, the OOK
Demodulator, and Reference and Control Logics.
Outside the device, the MICRF213 requires only three
components to operate; two capacitors (CTH, and
CAGC) and the reference frequency device, usually a
quartz crystal. An additional five components may be
used to improve performance. These are: power supply
decoupling capacitor, two components for the matching
network and two components for the pre-selector band
pass filter.
Receiver Operation
LNA
The RF input signal is AC-coupled into the gate circuit of
the grounded source LNA input stage. The LNA is a
Cascoded NMOS.
Mixers and Synthesizer
The LO ports of the Mixers are driven by quadrature
local oscillator outputs from the synthesizer block. The
frequency below the wanted signal. The local oscillator
is set to 32 times the crystal reference frequency via a
phase-locked loop synthesizer with a fully integrated
loop filter.
Image Reject Filter and Band-Pass Filter
The IF ports of the mixer produce quadrature down
converted IF signals. These IF signals are low-pass
filtered. This removes higher frequency products prior to
the image reject filter where they are combined to reject
the image frequencies. The IF signal then passes
through a third order band pass filter. The IF center
frequency is 0.86MHz. The IF BW is 235KHz @
315MHz, this will vary with RF operating frequency. The
IF BW can be calculated via direct scaling:
? Operating Freq (MHz) ?
? 315 ?
These filters are fully integrated inside the MICRF213.
After filtering, four active gain controlled amplifier stages
enhance the IF signal to proper level for demodulation.
OOK Demodulator
The demodulator section is comprised of detector,
local oscillator signal from the synthesizer is placed on
programmable
low pass
filter, slicer,
and
AGC
the low side of the desired RF signal. This allows
suppression of the image frequency at twice the IF
comparator.
May 2007
6
M9999-052307-A
(408) 944-0800
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