HP E3633A - Unregulated State; Unwanted Signals

Chapter 7 Tutorial
Output Characteristics
151
7
Unregulated State
,I#WKH#SRZHU#VXSSO\#VKRXOG#JR#LQWR#D#PRGH#RI#RSHUDWLRQ#WKDW#LV#QHLWKHU#&9#RU#
&&/#WKH#SRZHU#VXSSO\#LV#XQUHJXODWHG1#,Q#WKLV#PRGH#WKH#RXWSXW#LV#QRW#SUHGLFWDEOH1#
7KH#XQUHJXODWHG#FRQGLWLRQ#PD\#EH#WKH#UHVXOW#RI#WKH#DF#OLQH#YROWDJH#EHORZ#WKH#
VSHFLILFDWLRQV1#7KH#XQUHJXODWHG#FRQGLWLRQ#PD\#RFFXU#PRPHQWDULO\1#)RU#
H[DPSOH#ZKHQ#WKH#RXWSXW#LV#SURJUDPPHG#IRU#D#ODUJH#YROWDJH#VWHS>#WKH#RXWSXW#
FDSDFLWRU#RU#D#ODUJH#FDSDFLWLYH#ORDG#ZLOO#FKDUJH#XS#DW#WKH#FXUUHQW#OLPLW#VHWWLQJ1#
'XULQJ#WKH#UDPS#XS#RI#WKH#RXWSXW#YROWDJH#WKH#SRZHU#VXSSO\#ZLOO#EH#LQ#WKH#
XQUHJXODWHG#PRGH1#'XULQJ#WKH#WUDQVLWLRQ#IURP#&9#WR#&&#DV#ZKHQ#WKH#RXWSXW#LV#
VKRUWHG/#WKH#XQUHJXODWHG#VWDWH#PD\#RFFXU#EULHIO\#GXULQJ#WKH#WUDQVLWLRQ1
Unwanted Signals
$Q#LGHDO#SRZHU#VXSSO\#KDV#D#SHUIHFW#GF#RXWSXW#ZLWK#QR#VLJQDOV#DFURVV#WKH#
WHUPLQDOV#RU#IURP#WKH#WHUPLQDOV#WR#HDUWK#JURXQG1#7KH#DFWXDO#SRZHU#VXSSO\#KDV#
ILQLWH#QRLVH#DFURVV#WKH#RXWSXW#WHUPLQDOV/#DQG#D#ILQLWH#FXUUHQW#ZLOO#IORZ#WKURXJK#
DQ\#LPSHGDQFH#FRQQHFWHG#IURP#HLWKHU#WHUPLQDO#WR#HDUWK#JURXQG1#7KH#ILUVW#LV#
FDOOHG#QRUPDO#PRGH#YROWDJH#QRLVH#DQG#WKH#VHFRQG#FRPPRQ#PRGH#FXUUHQW#
QRLVH1#)LJXUH#:09#VKRZV#WKH#VLPSOLILHG#GLDJUDP#RI#FRPPRQ#PRGH#DQG#QRUPDO#
PRGH#VRXUFHV#RI#QRLVH1
1RUPDO#PRGH#YROWDJH#QRLVH#LV#LQ#WKH#IRUP#RI#ULSSOH#UHODWHG#WR#WKH#OLQH#IUHTXHQF\#
SOXV#VRPH#UDQGRP#QRLVH1#%RWK#RI#WKHVH#DUH#RI#YHU\#ORZ#YDOXH#LQ#WKH#+3#(6966$#
DQG#+3#(6967$1#&DUHIXO#OHDG#OD\RXW#DQG#NHHSLQJ#WKH#SRZHU#VXSSO\#FLUFXLWU\#
DZD\#IURP#SRZHU#GHYLFHV#DQG#RWKHU#QRLVH#VRXUFHV#ZLOO#NHHS#WKHVH#YDOXHV#ORZ1
&RPPRQ#PRGH#QRLVH#FDQ#EH#D#SUREOHP#IRU#YHU\#VHQVLWLYH#FLUFXLWU\#WKDW#LV#
UHIHUHQFHG#WR#HDUWK#JURXQG1#:KHQ#D#FLUFXLW#LV#UHIHUHQFHG#WR#HDUWK#JURXQG/#D#ORZ#
OHYHO#OLQH¦UHODWHG#DF#FXUUHQW#ZLOO#IORZ#IURP#WKH#RXWSXW#WHUPLQDOV#WR#HDUWK#
JURXQG1#$Q\#LPSHGDQFH#WR#HDUWK#JURXQG#ZLOO#FUHDWH#D#YROWDJH#GURS#HTXDO#WR#WKH#
FXUUHQW#IORZ#PXOWLSOLHG#E\#WKH#LPSHGDQFH1#7R#PLQLPL]H#WKLV#HIIHFW/#WKH#RXWSXW#
WHUPLQDO#FDQ#EH#JURXQGHG#DW#WKH#RXWSXW#WHUPLQDO1#$OWHUQDWHO\/#DQ\#LPSHGDQFHV#
WR#HDUWK#JURXQG#VKRXOG#KDYH#D#FRPSOHPHQWDU\#LPSHGDQFH#WR#HDUWK#JURXQG#WR#
FDQFHO#DQ\#JHQHUDWHG#YROWDJHV1#,I#WKH#FLUFXLW#LV#QRW#UHIHUHQFHG#WR#HDUWK#JURXQG/#
FRPPRQ#PRGH#SRZHU#OLQH#QRLVH#LV#W\SLFDOO\#QRW#D#SUREOHP1
7KH#RXWSXW#ZLOO#DOVR#FKDQJH#GXH#WR#FKDQJHV#LQ#WKH#ORDG1#$V#WKH#ORDG#LQFUHDVHV#
WKH#RXWSXW#FXUUHQW#ZLOO#FDXVH#D#VPDOO#GURS#LQ#WKH#RXWSXW#YROWDJH#RI#WKH#SRZHU#
VXSSO\#GXH#WR#WKH#RXWSXW#LPSHGDQFH#51#$Q\#UHVLVWDQFH#LQ#WKH#FRQQHFWLQJ#ZLUH#
ZLOO#DGG#WR#WKLV#UHVLVWDQFH#DQG#LQFUHDVH#WKH#YROWDJH#GURS1#8VLQJ#WKH#ODUJHVW#
SRVVLEOH#KRRN#XS#ZLUH#ZLOO#PLQLPL]H#WKH#YROWDJH#GURS1#8VLQJ#WKH#UHPRWH#VHQVH#
OHDGV#DW#WKH#ORDG#ZLOO#FRPSHQVDWH#IRU#OHDG#UHVLVWDQFH#LQ#WKH#ORDG#OHDGV1