(Preliminary)

Analog Frequency Multiplier

PL565-68 VCXO

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

PL565-68

62.5 - 160

125 - 320

311.04

-59

-93

-122

-137

-143

-149

-155

0.07

Phase noise was measured using Agilent E5052B.

SUB-HARMONIC PERFORMANCE

Part

Number

Input

Frequency

(MHz)

Output

Frequency

(MHz)

Carrier Frequency

(Fc)

@ -50%

(Fc)

@ +50%

(Fc)

PL565-68

155.52

311.04

311.04

-60

-60

Note: Spectral specifications were obtained usin g 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 sin e 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 only one

inductor per squarer is adequate for excellent performance.