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參數(shù)資料
| 型號(hào)： | UTC571 |
| 廠商： | 友順科技股份有限公司 |
| 英文描述： | COMPANDER Complete compressor and expandor in one IChip |
| 中文描述： | 擴(kuò)展器完整的壓縮機(jī)和expandor一個(gè)IChip |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大?。?/td> | 161K |
| 代理商： | UTC571 |
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UTC571
LINEAR INTEGRATED CIRCUIT
YOUWANG ELECTRONICS CO.LTD
8
CIRCUIT DETAILS—RECTIFIER
R1
V
IN
I=V
IN
/R1
V+
RS
10K
C
R
I
G
Figure 5. Rectifier Concept
Figure 5 shows the concept behind the full-wave averaging rectifier. The input current to the summing node of
the op amp, V
IN
R 1 , is supplied by the output of the op amp. If we can mirror the op amp output current into a
unipolar current, we will have an ideal rectifier. The output current is averaged by R5 , CR, which set the averaging
time constant, and then mirrored with a gain of 2 to become I
G
, the gain control current.
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
D1
I
1
I
2
C
R
R1
10K
R
S
10K
V
IN
Figure 6. Simplified Rectifier Schematic
Figure 6 shows the rectifier circuit in more detail. The op amp is a one-stage op amp, biased so that only one
output device is on at a time. The non-inverting input, (the base of Q 1 ), which is shown grounded, is actually tied
to the internal 1.8V V
REF
. The inverting input is tied to the op amp output, (the emitters of Q 5 and Q 6 ), and the
input summing resistor R 1 . The single diode between the bases of Q 5 and Q 6 assures that only one device is on
at a time. To detect the output current of the op amp, we simply use the collector currents of the output devices Q
5 and Q 6 . Q 6 will conduct when the input swings positive and Q 5 conducts when the input swings negative. The
collector currents will be in error by the a of Q 5 or Q 6 on negative or positive signal swings, respectively. ICs such
as this have typical NPN bs of 200 and PNP bs of 40. The a’s of 0.995 and 0.975 will produce errors of 0.5% on
negative swings and 2.5% on positive swings. The 1.5%
average of these
errors yields a mere 0.13dB gain error.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UTC571N | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:COMPANDER |
| UTC571NG-S16-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:COMPANDER |
| UTC571NG-S16-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:COMPANDER |
| UTC571NG-S16W-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:COMPANDER |
| UTC571NG-S16W-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:COMPANDER |
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