THS9001_08 Datasheet, PDF (11/20 Pages) STMicroelectronics – 50 MHz to 350 MHz CASCADEABLE AMPLIFIER

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THS9001
SLOS426B – NOVEMBER 2003 – REVISED JANUARY 2007
APPLICATION INFORMATION
The THS9001 is a medium power, cascadeable, amplifier optimized for high intermediate frequencies in radios.
The amplifier is unconditionally stable and design requires only 2 dc-blocking capacitors, 1 power-supply bypass
capacitor, 1 RF choke, and 1 bias resistor. Refer to Figure 25 for circuit diagram.
The THS9001 operates with a power supply voltage ranging from 2.5 V to 5.5 V.
The value of R_(BIAS) sets the bias current to the amplifier. Refer to Figure 7. This allows the designer to trade-off
linearity versus power consumption. R_(BIAS) can be removed without damage to the device.
Component selection of C_(BYP), C_IN, and C_OUT is not critical. The values shown in Figure 25 were used for all the
data shown in this data sheet.
The amplifier incorporates internal impedance matching to 50 Ω that can be adjusted for various frequencies of
operation by proper selection of L_(COL).
Figure 20 shows the s-parameters of the part mounted on the standard EVM with V_S = 5 V, R_(BIAS) = 237Ω , and
L_(COL) = 470 nH. With this configuration, the part is very broadband, and achieves greater than 15-dB input and
output return loss from 50 MHz to 325 MHz.
17
S11
V_S = 5 V,
0
R_(BIAS) = 237 W_,
16
S22
L_(COL) = 470 nH
−5
15
S21
−10
14
−15
13
S12
−20
12
11
−25
10
1M
10 M
100 M
f − Frequency − Hz
−30
1G
Figure 20. S-Parameters of THS9001 Mounted on the Standard EVM With V_S = 5 V, R_(BIAS) = 237 Ω,
and L_(COL) = 470 nH
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