I&Q Detector
PIQD Series
10MHz to 160MHz • 50dB Dynamic Range • 90° ±1° Phase Balance, typical • 1% Amplitude Match,
typical • Optimised for sub-microsecond pulse lengths • -55°C to +85°C Operating Range
Applications
q
Tracking Radars
q
Direction Finders
q
Monopulse Receivers
q
Doppler Measurement
q
MTI Receivers
The Pascall I & Q Detector Module gives an unambiguous
measurement of the phase difference between an IF input
signal and a reference input signal. The amplitude of the IF
input signal can also be derived from the two outputs.
In operation, the IF signal is passed through an amplifier (which defines
the upper end of the dynamic range) and a band limiting filter. It is then
split by the IF power divider, into two signals, that are equal in both
amplitude and phase. Each signal is then fed to one input of a pair of
analogue phase detectors.
0˚
REF INPUT
Amplifier
Quad
Hybrid
90˚
Phase
Detector
~
~
~
Video
Amp
E
I
E
I
= K E
V
cos 0
E
Q
= K E
V
sin 0
IF SIGNAL
INPUT E
V
Amp.
~
~
~
0˚
Power
Divider
0˚
Phase
Detector
~
~
~
Video
Amp
E
Q
MONITOR OUTPUT
(Optional)
The other inputs to the phase detectors are derived from the reference
input which is split into two signals by the quadrature hybrid; these are
equal in amplitude but have a quadrature phase relationship.
The outputs of the phase detectors are then passed through matched
low pass filters and video amplifiers. The video outputs EI and EQ
therefore give outputs proportional to the input signal voltage
multiplied by the sine and the cosine, respectively, of the phase
difference between the reference and IF input signal.
Computer Angular and Amplitude Accuracy
These accuracies are specified at an IF signal input level of -10dBm.
The stated accuracies include errors due to phase balance, amplitude
match and output offsets.
The computed phase is defined as:
o = tan
-1
E
Q
E
I
and the amplitude as:
Dynamic Range
The dynamic range is defined as the ratio of the modules' noise output
plus 3dB, with no signal input to the 1dB compression point in the
presence of a signal.
E
V
=
E
I
+ E
Q
K
2
2
The accuracies are defined as the maximum error between the values
Output Offset
The output offset is the voltage at the I or Q video outputs, with no
signal applied but with the specified reference input.
calculated from the output voltages, less the phase due to the
differential delay between the signal and reference channels, and the
actual input values.
Output Accuracy Video Bandwidth MHz
1
2
5
5
5
5
Output Amplitude Match %
Quadrature Accuracy deg
COMPUTED
Amplitude Accuracy dB
Angular Accuracy deg
Dynamic Range dB
Centre Freq. MHz
Model No. PIQD
Bandwidth MHz
PIQD Guaranteed Specifications
PIQD-1002
PIQD-3010
PIQD-6015
PIQD-7015
PIQD-12030
PIQD-16040
10
30
60
70
120
160
2
10
15
15
30
40
50
50
50
50
50
50
±2
±2
±2
±2
±2
±3
±2
±2
±2
±2
±2
±3
(Over temp range 0˚C- +60˚C)
±5
±5
±5
±5
±5
±7
±1
±1
±1
±1
±1
±1
500
100
75
75
50
50
Additional Specifications
Reference Input
Signal Input (for 1dB compression)
Dynamic Range
Signal filter bandwidth
Input VSWR
Overall Gain (K)
Output signal, I or Q (dc coupled)
Output load impedance
Output offset (with zero signal input power)
+10 dBm, ±2dB
0dBm, ±1dB
-50 to 0dBm min
10% to 25%
1.5:1 max
1.78 ±0.06
0.00V to 0.57V bipolar
Rise Time nsec
Ordering Information
PIQD-XXXXX-XXX
Temperature:
1 = 0 to +60°C
2 = -45°C to +85°C
3 = -55°C to +100°C
4 = Customer Specified
Supply Voltage: 1 =
±12V
or
2 =
±15V
Connectors:
A = SMA
B = SMB
C = SMC
Signal Bandwidth MHz
50ohms
±0.5mV (0°C to +60°C) max
±1.0mV (-55°C to +85°C) max
+15V @ 300mA, -15V@ 200mA max
300g (10.6oz) max
Bright Tin, generally in accordance with MIL-T-10727
Centre Frequency MHz
Power requirements
Weight
Finish
Options
q
High dynamic range to 80dB
q
Phase and amplitude
adjustment
q
Customer specified signal
and video bandwidths
q
+12V operation
q
SMB or SMC connectors
q
Reference input in range
0 to +13dBm
q
Phase detector
models available
q
Centre frequencies in the
range 10MHz to 500MHz
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