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參數(shù)資料
| 型號： | MAX2473EVKIT |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL KIT MAX2472, MAX2473 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
MAX2472/MAX2473
500MHz to 2500MHz
VCO Buffer Amplifiers
10
______________________________________________________________________________________
Applications Information
Input Considerations
The MAX2472/MAX2473 offer high-impedance inputs
ideal for low-distortion buffering of a VCO. For applica-
tions with discrete transistor-based oscillator designs,
simply AC-couple the oscillator directly to the input; the
buffer’s high input impedance results in minimal load-
ing on the oscillator. For use with 50
VCO modules,
determine the approximate input impedance (S11) of
the MAX2472/MAX2473 from the S parameter tables in
the
Typical Operating Characteristics. Terminate the
buffer input with a shunt resistor “RTERM” such that
RTERM
|| RE[S11] = 50, and use a series blocking
capacitor between the shunt resistor and the device
input. This provides a very stable 50
termination and
increases reverse isolation. For those applications
needing both high gain and good input match, reac-
tively match the buffer inputs to 50
with simple two-
element matching circuits. Figure 1 shows an equivalent
input circuit of the MAX2472/MAX2473 IN pin.
Output Considerations
The MAX2472/MAX2473 outputs are configured as
open-collector output stages, allowing maximum flexi-
bility. To achieve maximum gain and output drive, reac-
tively match these outputs with a shunt inductor/choke
to VCC followed by a series capacitor (DC block). For
applications not requiring high gain and output drive
(PLL prescaler), use a simple resistor to VCC followed
by a DC blocking capacitor. Figure 2 shows an equiva-
lent circuit of the MAX2472/MAX2473 OUT pin(s).
Figure 3 shows an equivalent circuit of the MAX2473
BIAS pin.
Output Matching Circuit
Table 1 lists recommended values for lumped-element
output matching circuits at certain frequencies. For fre-
quencies other than those specified, use the parame-
ters given in the
Typical Operating Characteristics.
Layout and Power-Supply Bypassing
A properly designed PC board is essential to any
RF/microwave circuit. Be sure to use controlled imped-
ance lines on all high-frequency inputs and outputs.
Bypass the power supply with decoupling capacitors
VCC
(PIN 6)
250
1k
33
1.3pF
GND
(PIN 5)
IN
(PIN 4)
Figure 1. Input Structure
VCC
(PIN 6)
2k
OUT
10
GND
(PIN 2)
Figure 2. Output Structure
VCC
(PIN 6)
BIAS
(PIN 3)
INTERNAL
1.2V
REFERENCE
GND
(PIN 2)
1k
Figure 3. BIAS Structure (MAX2473 only)
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