CMX971 Datasheet, PDF (23/25 Pages) CML Microcircuits – Small 16-lead VQFN Package

Quadrature Modulator
9.1.3.3 AC Parameters – Modulator
For the following conditions unless otherwise specified:
V_DD = V_CC = 3.3V; V_SS = V_RFGND = V_LOGND = 0V. LO Level = -10dBm and T_AMB = +25ºC.
Quadrature Modulator
Notes
Min.
Typ.
I/Q Input Common Mode Voltage
–
I/Q Mixer Input Voltage
–
Modulator Input Bandwidth
–
Gain from I/Q Input to Output
11
–
Output Frequency Range
20
Transmit Output Power (PEP)
8
–
Noise Floor
10
–
Wideband Noise During Modulation
12
–
Image Suppression
At 100MHz
–
At 500MHz
–
At 1000MHz
–
I/Q Gain Matching Error
–
I/Q Phase Matching Error
–
Carrier Suppression
At 100MHz
–
At 500MHz
–
At 1000MHz
–
Equivalent Output IP3
13, 14
–
Load Impedance
–
Discrete Unwanted Emissions (other
9
–
than harmonics of the output) in the
Frequency Range 9kHz –12.75GHz.
1.6
–
25
-4
–
0
-150
-146
50
52
44
–
–
-50
-50
-49
21
50
-
Max.
–
1
–
–
1000
–
–
–
40
–
40
0.5
1
-40
–
-40
–
–
-70
CMX971
Units
V
Vp-p
MHz
dB(V/V)
MHz
dBm
dBm/Hz
dBc/Hz
dB
dB
dB
dB
degree
dBm
dBm
dBm
dBm

dBc
Notes:
8. Typical output power is achieved with the typical input drive level stated on I and Q channels,
operation at 500MHz (sine and cosine waveforms on I and Q respectively).
9. With a spurious-free LO input and -10dBm output level.
10. Measured with TXIN, TXIP, TXQN, TXQP connected to 1.6V with 10 resistors decoupled by
33nF capacitors; measured at 20MHz offset from the operating frequency of 380 MHz.
11. Voltage gain measured from modulator input to output using 7kHz sine/cosine waves on
TXIN/TXQN, at 500MHz.
12. Control Register ($1E), b3-b0 = ‘1111’.
13. Control Register ($1E), b3-b0 = ‘0000’.
14. Optimum performance for I/Q signals up to 2 MHz.
 2015 CML Microsystems Plc
23
D/971/4