RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
8.1.3.3 AC Parameters - Transmitter
I/Q Modulator
Notes
Min.
Typ.
Max.
Units
Input Signal Level
40
–
2.0
–
Vp-p
Gain Control Steps
–
+6, 0, -6
–
dB
V
Input Common Mode Range
Input Voltage Range (on each input)
Third Order IMD Products
IMD Products (greater than third order)
Carrier Leakage
41
VSS+1.0
VDD/2
–
VDD-1.0
VDD-0.5
-50
VSS+0.5
V
–
–
–
–
–
–
dBc
dBc
dBc
dBc
MHz
–
-60
-30
-40
–
–
Image Suppression
-30
I or Q Modulation Bandwidth (-3dB)
42
1
Notes:
40. The 2.0Vp-p is a differential signal. For clarity, this means +/-0.5V on each input.
41. The common mode range is based on a 2.0Vp-p differential input signal level.
42. This is the maximum modulation frequency that should be applied in the I or Q channel.
The bandwidth of the modulator is much higher than this but use of higher modulation
frequencies may result in an increase in distortion products.
Post Modulator Filter
Notes
Min.
Typ.
45, 60,
90, 120
-2
Max.
Units
MHz
dB
Selectable Filter Bandwidth
–
–
–
–
Gain
Stopband (45MHz Mode)
>135MHz
–
–
–
–
30
30
30
30
–
–
–
–
dB
dB
dB
dB
Stopband (60MHz Mode)
>170MHz
Stopband (90MHz Mode)
>270MHz
Stopband (120MHz Mode)
>360MHz
Tx IF Output
45
46
Frequency Range
Output Signal Level
Wideband Noise at 1MHz
Output Impedance
45
–
–
120
–
MHz
dBm
dBc/Hz
Ω
-10
-142
50
–
–
–
–
Notes:
45. At pin TXIFOUT.
46. For specified I/Q Modulator Input Signal Level.
2012 CML Microsystems Plc
52
D/991_992/18
CMLMICRO [ CML MICROCIRCUITS ]
