THS9000 Datasheet, PDF (10/18 Pages) Texas Instruments – 50 MHz to 400 MHz CASCADEABLE AMPLIFIER

THS9000
SLOS425B – DECEMBER 2003 – REVISED APRIL 2006
APPLICATION INFORMATION
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The THS9000 is a medium power, cascadeable, amplifier optimized for high intermediate frequencies in radios.
The amplifier is unconditionally stable and the design requires only 2 dc-blocking capacitors, 1 power-supply
bypass capacitor, 1 RF choke, and 1 bias resistor. Refer to Figure 25 for the circuit diagram.
The THS9000 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 10. 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 50Ω that can be adjusted for various frequencies of
operation by proper selection of L_(COL).
Figure 19 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.
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) = 68 nH. With this configuration, the part achieves greater than 15-dB input and output return loss from
250 MHz to 400 MHz.
17
5
S11
S21
V_S = 5 V,
R_(BIAS) = 237 W_,
16
L_(COL) = 470 nH ₀
16
S22
15
5
S21
0
15
−5
S11
−5
14
14
−10
13
−15
S22
12
−20
11
S12
−25
10
1M
10 M
100 M
f − Frequency − Hz
−30
1G
Figure 19. S-Parameters of THS9000 mounted on the
standard EVM with V_S = 5 V, R_(BIAS) = 237 Ω,
and L_(COL) = 470 nH
−10
13
−15
12
S12
−20
11 _{VS = 5 V,}
R_(BIAS) = 237 W_,
L_(COL) = 68 nH
10
1M
10 M
100 M
f − Frequency − Hz
−25
−30
1G
Figure 20. S-Parameters of THS9000 mounted on the
standard EVM with V_S = 5 V, R_(BIAS) = 237 Ω,
and L_(COL) = 68 nH
10
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