RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
IF Amplifier and I/Q Demodulator
Notes
Min.
Typ.
Max.
Units
Gain
10, 17
–
43
–
dB(V/V)
Noise Figure
10, 11
10, 17
–
–
13
-20
–
–
–
dB
dBm
MHz
MHz
Ω
Third Order Intercept Point (Input)
Input Frequency Range
LO Frequency Range
Input Impedance
10
40
–
150
600
–
12
15
–
1800
20
–
Output Impedance
–
–
Ω
LO Leakage at Input
1dB Compression Point
VGA Control Range
VGA Step Size
–
-27
–
dBm
dBm
dB
13
14
-30
–
–
48
6
–
4
8
dB
VGA Response Time
Image Rejection (I/Q Gain/Phase matching)
I/Q Output Bandwidth (-3dB)
1MHz Mode
E
–
–
10
–
µs
30
40
dB
16
1
1.4
–
–
MHz
kHz
100kHz Mode
100
135
Notes:
10. Measured from an un-matched 50Ω input source to a differential I or Q output voltage; test
frequency = 45MHz. Note that values include combined response of IF amplifier, I/Q
demodulator and I/Q filter stages; see also section 7.7 for further details.
11. At maximum VGA setting (0dB); see section 7.7 for further details.
12. LO Supplied at four times the IF frequency.
13. At maximum gain.
14. Eight VGA steps.
15. Based on single ended input at 45MHz.
16. In 1MHz output mode an IF output in the range 450kHz to 465kHz is supported.
17. Gain reduces at higher IFs.
I/Q Filters
Notes
Min.
Typ.
Max.
Units
Gain
20
–
N/A
–
dB(V/V)
Noise Figure
20
20
20
–
–
N/A
N/A
N/A
–
–
–
–
–
–
–
4
dB
dBm
Ω
Third Order Intercept Point (Input)
Output Impedance
–
Output Anti-alias Filter Stop-band
Stop-band Attenuation
1.92
55
–
MHz
dB
–
Data Filter Bandwidth (-3dB)
Differential Output Voltage Swing
100
–
kHz
Vp-p
21
–
Notes:
20. Performance included in overall performance of I/Q Demodulator.
21. This is the maximum swing to guarantee meeting the third order distortion characteristics
under the specified conditions and is not the maximum limiting value. For clarity, this
means that the device has the capability to produce +/-1V on each of the differential
outputs. The outputs are capable of driving a load resistance across the differential
outputs of 1kΩ. This voltage output capability provides easy interfacing to other CML
devices, like the CMX981, which has a maximum input signal amplitude of 2.4Vp-p.
2012 CML Microsystems Plc
50
D/991_992/18
CMLMICRO [ CML MICROCIRCUITS ]
