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 +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

TT

(dBm)

(mV)

(pF)

(

Ω

Ω)

(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