參數(shù)資料
型號: TSH512CF
廠商: STMICROELECTRONICS
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝: 10 X 10 MM, ROHS COMPLIANT, TQFP-44
文件頁數(shù): 17/31頁
文件大小: 1350K
代理商: TSH512CF
General description
TSH512
24/31
Doc ID 8120 Rev 7
5.6
PEA section: pre-emphasis
The amplitude-regulated audio coming from the ALC feeds the positive input of the
operational amplifier called PEA (pre-emphasis). The pre-emphasis consists in a high-pass
filter in order to compensate the behavior of the FM transmission.
Figure 32.
Pre-emphasis schematics
RPEA1 and CPEA1 set the time constant of the pre-emphasis as:
τ = RPEA1. CPEA1
50 s or 75 s time constants are generally used.
Choosing the gain of the PEA stage also allows one to set the right modulation level to the
varicap diode. The gain in the passband is:
GPEA = 1+ (RPEA2/RPEA1)
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