45MHz to 650MHz, Integrated IF

VCOs with Differential Output

MAX2606

REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY

790

740

690

640

590

540

490

440

390

340

290

240

190

75 80

85 90

95

100 105 110 115 120 125 130 135

EFFECTIVE INDUCTANCE

FROM IND TO GND

INDUCTOR VALUE

MOUNTED ON EV KIT

140

70

140 145 150

MEASUREMENT CONDITIONS

VCC = 2.75V, TA = 25°C,

RLOAD = 100Ω||50Ω (100Ω RESISTIVE PULL-UP PARALLELED WITH 50Ω

VNA IMPEDANCE), UNUSED OUTPUT TERMINATED IN 50

Ω,

PCB PARASITIC SHUNT CAPACITANCE (IND TO GND) = 0.45pF

THE INDUCTANCE LISTED IS THE PRECISE NOMINAL INDUCTANCE VALUE

REQUIRED FROM IND TO GND IN ORDER TO GUARANTEE THE VCO

CAN TUNE TO THE DESIRED FIXED FREQUENCY, OVER ALL OPERATING

CONDITIONS AND WORST-CASE COMPONENT

VALUES (

±2% INDUCTOR AND IC PROCESS VARIATION).

DESIRED VCO FIXED FREQUENCY (MHz)

Figure 2. MAX2606 Required Inductance vs. Desired VCO Fixed Frequency

MAX2605–MAX2609

8

Maxim Integrated