THS9000_15 Datasheet, PDF (10/24 Pages) Texas Instruments – 50 MHz to 750 MHz CASCADEABLE AMPLIFIER

THS9000
SLOS425E – DECEMBER 2003 – REVISED DECEMBER 2013
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 two dc-blocking capacitors, one power-supply
bypass capacitor, one RF choke, and one bias resistor. Refer to Figure 26 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 11. 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 26 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) = 237 Ω, 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 21 shows the S-parameters of the part mounted on the standard EVM with V_S = 5 V, R_(BIAS) = 237 Ω, 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 20. 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 21. 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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