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參數(shù)資料
| 型號： | CLC5509 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Ultra-Low Noise Preamplifier |
| 中文描述： | 超低噪聲前置放大器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 445K |
| 代理商： | CLC5509 |
Typical Performance Characteristics
(Continued)
Application Information
Introduction
The CLC5509 is a two stage ultra-low noise preamplifier,
with low distortion, and externally variable input impedance.
The unusual emitter driven input stage remains stable for a
wide range of transducer source loads. The input termination
can be matched (for 50-200
source matching) to a wide
range of complex loads (C
up to 5000pF and C
up to
10000pF, L
up to 1μH). The IC was designed for low cost
multiple channel ultrasound applications requiring flexible
configurations for a variety of transmit/receive topologies. In
a typical application, the CLC5509 is connected to a single
element
of
an
ultrasound
transmit/receive switch.
Theory of Operation
The CLC5509 simplified circuit is shown in Figure 1 For
analysis, the transmit/receive switch diode is modeled in the
circuit as a series resistance R
with a voltage drop of V
.
A piezo transducer generated, single-ended voltage signal is
applied to the emitter input of the 1st stage. The voltage sig-
nal is converted to a current (i) that is passed through a high
pass filter then restored back to a voltage signal at R
.Ahigh
speed, low distortion, unity gain buffer, applies the signal to
the load and feedback resistor. Negative feedback from the
buffer output to the inverting input completes the signal path.
transducer
through
a
The input and output voltage can be expressed as shown:
V
in
= (R
TR
+ r
e
) i + V
O
(R
1
/(R
1
+ R
2
))
V
O
= (i x R
g
)
for
α
= 1
The input resistance is calculated
The current I
BIAS1
is the input stage emitter current that
sets r
e
.
I
BIAS1
= (V
EE
- V
TR
)/R
BIAS1
for V
EE
= V
TR
= .65V
r
e
= 26mV/I
BIAS1
Combining
terms,
then
solving
V
O
/V
in
results in
for
close
loop
gain
Negative PSRR (V
EE
)
DS101304-28
DS101304-29
FIGURE 1. Simplified Circuit
C
www.national.com
8
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CLC5509CM | Ultra-Low Noise Preamplifier |
| CLC5523 | Low-Power, Variable Gain Amplifier |
| CLC5523I | Low-Power, Variable Gain Amplifier |
| CLC5523IMX | Low-Power, Variable Gain Amplifier |
| CLC5523IN | Low-Power, Variable Gain Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CLC5509CM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Ultra-Low Noise Preamplifier |
| CLC5509PCASM | 功能描述:BOARD EVALUATION FOR CLC5509 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| CLC5523 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low-Power, Variable Gain Amplifier |
| CLC5523I | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low-Power, Variable Gain Amplifier |
| CLC5523IM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low-Power, Variable Gain Amplifier |
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