45MHz to 650MHz, Integrated IF
VCOs with Differential Output
MAX2605
REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
REQUIRED INDUCTANCE (nH)
45
47
49 51 53 55
57
59 61 63 65 67
69
EFFECTIVE INDUCTANCE
FROM IND TO GND
INDUCTOR VALUE
MOUNTED ON EV KIT
MEASUREMENT CONDITIONS
V
CC
= 2.75V, T
A
= 25°C,
R
LOAD
= 100Ω||50Ω (100Ω RESISTIVE PULL-UP PARALLELED WITH 50Ω
VNA IMPEDANCE), UNUSED OUTPUT TERMINATED IN 50Ω,
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)
