45MHz to 650MHz, Integrated IF

VCOs with Differential Output

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9

MAX2607

REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY

160

150

140

130

120

110

100

90

80

70

60

50

40

160 170 180 190

200

210

220 230 240

250 260 270 280

INDUCTOR VALUE

MOUNTED ON EV KIT

30

150

290 300

170

EFFECTIVE INDUCTANCE

FROM IND TO GND

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 3. MAX2607 Required Inductance vs. Desired VCO Fixed Frequency