AN530| Application Note
Maxim > App Notes > WIRELESS, RF, AND CABLE Keywords: rf, rfdesign, rfic, vco, rfics, rf design, rf ics
Dec 07, 2000
APPLICATION NOTE 530
VCO Tank Design for the MAX2310
Abstract: This application note presents various voltage-controlled oscillator (VCO) designs for popular IF frequencies of 85MHz, 190MHz, and 210MHz. These designs reduce the number of iterations required for optimized results. Analysis can be accomplished with a simple spreadsheet program. Additional Information:
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Wireless Product Line Page Quick View Data Sheet for the MAX2306/MAX2308/MAX2309 Quick View Data Sheet for the MAX2310/MAX2312/MAX2314/MAX2316 Applications Technical Support
Introduction
This application note presents various voltage-controlled oscillator (VCO) designs for popular IF frequencies of 85MHz, 190MHz, and 210MHz. These designs reduce the number of iterations required for optimized results. Analysis can be accomplished with a simple spreadsheet program.
VCO Design
Figure 2 shows the differential tank circuit used for the MAX2310 IF VCO. For analysis purposes, the tank circuit must be reduced to an equivalent simplified model. Figure 1 depicts the basic VCO model. The frequency of oscillation can be characterized by EQN1:
EQN1
fosc = frequency of oscillation L = inductance of the coil in the tank circuit Cint = internal capacitance of the MAX2310 tank port Ct = total equivalent capacitance of the tank circuit
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