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8
___________________Maxim Integrated Produc ts, 120 S an Gabriel Drive, S unnyvale, CA 94086 (408) 737-7600
1995 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
Prec ision Quadrature Generator
M
____________________________Features
o
Precision Quadrature Generation
(<1.5° at 650MHz)
o
Wide Input Frequency Range (400MHz to 700MHz)
_________________________Desc ription
The X2118 Precision Quadrature Generator cell uses a
delay-locked loop to provide tight amplitude and phase
matching. The input from an external VCO drives a
buffer and a delay line consisting of three electronically
variable delay cells. The output of the delay line drives
a second buffer identical to the first. The buffer outputs
are compared by a phase detector whose error signal
drives the variable delay cells to adjust the phase dif-
ference to 90°. This method provides precise quadra-
ture generation over the wide input frequency range of
400MHz to 700MHz.
Cell Dimensions: 570μm x 1800μm
0°
-90°
I OUT
2
QOUT
2
LOIN
X2118
X2118 PRECISION QUADRATURE
GENERATOR
KEY ELECTRICAL CHARACTERISTICS
(T
A
= 0°C to +70°C, unless otherwise noted.)
_____________________Bloc k Diagram
PORT LIST
f
LO
= 650MHz
f
LO
= 650MHz
CONDITIONS
°
1.5
Φ
Output Phase Mismatch
Output Level
Output Amplitude Mismatch
LO Input Level
LO Input VSWR
Supply Current
MHz
400
700
f
LO
LO Frequency
mV
mV
dBm
400
Vo (pk-pk)
Vo
V
LO
12
0
2:1
-10
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
ZC = 50
mA
20
I
CC
- Quadrature output
+ Inphase output
- Inphase output
+ Quadrature output
+ Input
- Input
GND
250μA PTAT reference current input
(from X2112 or equivalent)
+5V supply
DESCRIPTION
QB
I
IB
Q
P250
PORT NAME
250μA constant reference current input
(from X2112 or equivalent)
Substrate connection (GND)
SUB
DESCRIPTION
IP
IPB
V
EE
V
CC
K250
PORT NAME
V
CC
= 5.0V ±5%