Alpha Industries, Inc. [781] 935-5150
Fax [978] 241-7906 Email sales@alphaind.com www.alphaind.com
1
Specifications subject to change without notice. 9/01A
Sampling Phase Detectors
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
SPD1101-111, SPD1102-111, SPD1103-111
Characteristic
Value
Incident Power
27 dBm
Operating Temperature
-65 to +150C
Storage Temperature
-65 to +175C
ESD Human Body Model
Class 1B
Absolute Maximum Ratings
Electrical Characteristics at 25C
Microwave Signal
Schottky Diode
Capacitor
Step Recovery Diode
Part Number
Drive Level
Barrier
V
F
@ 1 mA
C
J
@ 0 V
R
T
@ 5 mA
C
C
C
J
@ 6 V
T
L
TT
(dBm)
(mV)
(pF)
(
)
(pF)
(pF)
(nS)
(pS)
Typ.
Max.
Max.
Typ.
Max.
Typ.
Typ.
SPD1101-111
-3 to 0
Low
270350
0.10
24
0.5
0.25
10
70
SPD1102-111
0 to +3
Medium
370550
0.10
24
0.5
0.25
10
70
SPD1103-111
0 to +13
High
600700
0.10
24
0.5
0.25
10
70
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.
Preliminary
Sampling Phase Detectors
SPD1101-111, SPD1102-111, SPD1103-111
2
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
Typical Performance
0
4
2
6
8
10
20 22
12 14 16 18
Best Note Voltage (mV)
VCO Frequency (GHz)
SPD1101-111
0
200
400
600
800
1000
Ref. Frequency: 100 MHz
Ref Input Power: 17 dBm
VCO Power: 0 dBm
Suggested Circuit
REFERENCE
FREQUENCY
INPUT
10500 MHz
47 pF
47 pF
INPUT
TRANSFORMER
22 pF
C
L
C
L
39 pF
RFC
SRD
IF
OUTPUT
VCO
INPUT
100
100
100
10 k
10 k
-111 Package Outline
0.110 (2.794 mm)
1
2
3
4
A1
5
0.090 (2.286 mm)
0.015
(0.381 mm)
0.073 (1.854 mm)
0.053 (1.346 mm)
0.017 (0.432 mm)
0.000
0.002 (0.051 mm)
0.088 (2.235 mm)
0.000
0.017 (0.432 mm)
0.037 (0.940 mm)
0.073 (1.854 mm)
0.093 (2.362 mm)
0.108
(2.743 mm)
0.072
(1.829 mm)
0.002
(0.051 mm)
0.039
(0.941 mm)
0.040
(1.016 mm)
EPOXY
CERAMIC
Schematic Diagram
3
5
1
2
SCHEMATIC
SRD
4
Input transformer: 10:1 step down impedance ratio.
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