(Preliminary)

Analog Frequency Multiplier

PL560/565-08 VCXO Family

PHASE NOISE PERFORMANCE

Part

Number

Input

Freq.

Range

(MHz)

Output

Freq.

Range

(MHz)

Phase Noise at Frequency Offset From Carrier (dBc/Hz)

Phase

Jitter

12KHz ~

20MHz

(ps)

Carrier

Freq.

(MHz)

10

Hz

100

Hz

1

kHz

10

kHz

100

kHz

1

MHz

10

MHz

PL560-08

62.5 - 150

250 - 600

491.52

-64

-96

-123

-135

-141

-150

-155

0.05

PL565-08

150 - 200

600 - 800

622.08

-56

-87

-113

-134

-143

-149

-153

0.04

Phase noise was measured using Agilent E5052B.

SUB-HARMONIC PERFORMANCE

Part

Number

Input

Frequency

(MHz)

Output

Frequency

(MHz)

Carrier

Freq.

(Fc)

@

-75%

(Fc)

@

-50%

(Fc)

@

-25%

(Fc)

@

+25%

(Fc)

@

+50%

(Fc)

@

+75%

(Fc)

PL560-08

122.88

491.52

491.52

-60

-40

-70

-70

-40

-70

PL565-08

155.52

622.08

622.08

-60

-40

-40

-40

-40

-50

Note: Spectral specifications were obtained using Agilent E7401A

AFM MULTIPLYING TECHNIQUE

The analog frequency multiplication is achieved through a “squaring” operation.

The math is as follows: SIN²(x) = 0.5 - 0.5×COS(2x)

A very important property of this processing is that the result is a pure sine wave with double frequency. In theory

there are no sub harmonics but in practice the squaring operation is not perfect and a low level of sub harmonics

is present anyway. The key is that the resulting sub harmonics are very low and simple filtering with o nly one

inductor per squarer is adequate for excellent performance.