Preliminary
Sampling Phase Detectors
SPD1101-111, SPD1102-111, SPD1103-111
Features
I
For Phase Locked VCOs to 22 GHz
I
Reference Frequencies Below 50 MHz
I
New Surface Mount Package Design
I
Small Footprint (90 x 110 Mils)
I
Automated Chip on Board Construction
Description
Alpha has redesigned its product line of sampling phase
detectors using automated chip on board manufacturing
technology to provide a more uniform, surface mountable,
small footprint device without sacrificing the microwave
performance of the original design.
Sampling phase detectors are used to phase lock a
microwave VCO to a stable reference source at a
submultiple frequency. The sampling phase detector
consists of a step recovery diode, capacitors and a
microwave mixer consisting of series pair Schottky
diodes. The principle of operation may be described as
using the step recovery diode to generate a harmonic comb
of the reference oscillator frequency and the Schottky diode
as a mixer between the closest reference frequency multiple
and the microwave signal generated by the VCO. When
these frequencies are identical the IF (beat note) signal is
a DC voltage; the IF will be sinusoidal when the
frequencies are unequal.
The SPD1100 series sampling phase detectors use a
selected step recovery diode chip whose carrier lifetime and
transition time are appropriate for use in applications
allowing reference frequencies below 50 MHz and
microwave VCO frequencies as high as 22 GHz. The
Schottky diodes used are low capacitance devices
capable of efficient mixer performance at frequencies above
22 GHz. The SPD1101-111, SPD1102-111 and
SPD1103-111 utilize low, medium and high barrier
Schottky diodes and may be selected according to the
available power generated by the microwave VCO.
Absolute Maximum Ratings
Characteristic
Incident Power
Operating Temperature
Storage Temperature
ESD Human Body Model
Value
27 dBm
-65 to +150°C
-65 to +175°C
Class 1B
Electrical Characteristics at 25°C
Part Number
Microwave Signal
Drive Level
(dBm)
Typ.
SPD1101-111
SPD1102-111
SPD1103-111
-3 to 0
0 to +3
0 to +13
Low
Medium
High
270–350
370–550
600–700
Schottky Diode
Barrier
V
F
@ 1 mA
(mV)
C
J
@ 0 V
(pF)
Max.
0.10
0.10
0.10
R
T
@ 5 mA
Ω
(Ω)
Max.
24
24
24
Capacitor
C
C
(pF)
Typ.
0.5
0.5
0.5
Step Recovery Diode
C
J
@ 6 V
(pF)
Max.
0.25
0.25
0.25
T
L
(nS)
Typ.
10
10
10
TT
(pS)
Typ.
70
70
70
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[978] 241-7906
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 9/01A
1
ALPHA [ ALPHA INDUSTRIES ]
