ALPHA SPD1101-111, SPD1102-111, SPD1103-111 Datasheet

Alpha Industries, Inc. [781] 935-5150 • Fax [978] 241-7906 • Email [e-mail] • www.alphaind.com 1

Specifications subject to change without notice. 9/01A

Sampling Phase Detectors

Features

■ For Phase Locked VCOs to 22 GHz

■ Reference Frequencies Below 50 MHz

■ New Surface Mount Package Design

■ Small Footprint (90 x 110 Mils)

■ Automated Chip on Board Construction

SPD1101-111, SPD1102-111, SPD1103-111

Characteristic Value

Incident Power 27 dBm

Operating Temperature -65 to +150°C

Storage Temperature -65 to +175°C

ESD Human Body Model Class 1B

Absolute Maximum Ratings

Electrical Characteristics at 25°C

Microwave Signal

Schottky Diode Capacitor Step Recovery Diode

Part Number Drive Level Barrier V

F

@ 1 mA CJ@ 0 V RT@ 5 mA C

C

CJ@ 6 V T

L

TT

(dBm) (mV) (pF) (ΩΩ) (pF) (pF) (nS) (pS)

Typ. Max. Max. Typ. Max. Typ. Typ.

SPD1101-111 -3 to 0 Low 270–350 0.10 24 0.5 0.25 10 70

SPD1102-111 0 to +3 Medium 370–550 0.10 24 0.5 0.25 10 70

SPD1103-111 0 to +13 High 600–700 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 [e-mail] • www.alphaind.com

Specifications subject to change without notice. 9/01A

Typical Performance

0426810 202212 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

10–500 MHz

47 pF

47 pF

INPUT

TRANSFORMER

22 pF

C

L

C

L

39 pF

RFC

SRD

IF

OUTPUT

VCO

INPUT

100 Ω

100 Ω

100 Ω

10 kΩ

10 kΩ

-111 Package Outline

0.110 (2.794 mm)

12

3

4

A1

50.090 (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

35

12

SCHEMATIC

SRD

4

Input transformer: 10:1 step down impedance ratio.