1、h # 4FOJPS“QQMJDBUJPO / (O/E) : , .h # h ;Z0High ZAC DCDifferential . DifferentialHighVoltage f 1 a T qA!NV#$ %65 M b I n “ & $ | T a a a & | q %$ ) L) .) & |E F Ea a & I n %65#NV & NV E F PIN .PIN & NV z 6 HWbh Y f h#NVf h#NVGain = - RCREf0= 12 RCCCGain = - (RC|RP)REf0=2 (RC|RP)(CC+CP)1NOTE: VCC DU
2、TVCCCCRCh#NVRPCPREVINh Y “df Uo h A! h zgY T 6 HWY T /h z v.s.“d z( ) ( ) ( )222 6 HW 6 HW 6 HW 6 HWh Uo | +=f z 6 HW 1“ # z T /f N T9 V A Uo #h z z5 zYl9 J z| zb2221111+=h z Uo z| z z“d z v.s.?o70.7 -3dB0.1 0.2 0.3 0.4 0.5 0.6 0.8 0.9 1.00.710097.59592.59087.58582.58077.57572.53% |/L=| q /“d z1 l 3
3、%?o , “d zK ?o| q3bUo z?o| q 10 HKD bUo z?o| q H r 30% 3dBb CinP 6 HW tr9FCin= 100pF22 ns(10X h Cin= 10pF220 ns(1X h )tr2.2 (Rs* Cin)Vsource10 MCInLGround Leadhtr=3nsRs=1kz 1X $h 6 HWo100%90%10%0%100%90%10%0%z 10X $ 6 HWoh #|E Fh E FFrequency100M10M1M100k10k1k100101100 1k 10k 100k 1M 10M 100M 1G 10G
4、InputImpedanceZo0.15 pF/500 Active1.0 pF/1 M1X Passive100 pF/1 M10X Passive10 pF/10 M10X Passive probe loading goes to 159 at 100 MHzhLrLf r/ E F z zYvbf L YrvlT 3 | 1 2 PrL h / 0.5 - 1 H(Ls+Lg)VsourceCInRs= 50 LsourceLGround Leadtr= 1 ns10 MB 10X$h Cin=10 pF#6jLrL 50 - 70 MHz= 6 jLh/ q=LC10 pF tr=
5、7 - 5 nshL BNC h 1” L3” E FL 6” L LhLr Ha qa# H1 I nf hS 4 ns 8 nsbf h/ Uo “deskew( F| )” ? h“hbf hWlz 200 ps )(bh. VsourceRsource8 - 12 pF9 M 500 7 - 50 pF20 pFUo 1 M$ hLGround Leadh 8 - 10 pF/ft1.5 ns/fth6 feetC1R1R2C2C3R3$h (LF)50 kHz 50 kHz 50 kHz1us/div 1us/div1us/div1 ms/div 1 ms/div 1 ms/div
6、4V$h (LF)f Xh f Xh r , 9 / YbRin= Cin= 0 z = Xhf zKvf 0f EKvf SKv (Dynamic Range)f 1:1 hf f M M (Phase Shift)f a 15 MHz 23 ns 100 pF 1 M100 MHz -500 MHz3.5 ns -700 ps13 pF -8 pF10 M3 GHz -9 GHz120 ps -40 ps1 pF -0.15 pF500 500 MHz -4 GHz700 ps -100 ps2 pF -0.4 pF10 M -100 k1X h10XhZ0 hh T z E 6 HWh?
7、 :z Q z vz z* 50 30 pF/ft hhUh 8 - 10 pF/ft *1.5 ns/ft20 pF1 M6 feetVsourceRsourceUo $ LGround Lead :z 1X hz NLR9h :z z 50 “dY z A :z Ez z Sz N z T%z 1 1X h 9h VsourceRsource8 - 12 pF9 M 500 7 - 50 pF20 pFUo 1 M$ hLGround Leadh 8 - 10 pF/ft1.5 ns/fthU6 feetC1R1R2C2C3R3450 0.5 pF50 VsourceRsourceUo $
8、 hLGround LeadhUh 50 6 feet50 10X h :z E Fz A! 50 :z z z Sz F E 50 # 1 “dY z 10X h h Uo bv h 50 VsourceRsource$ LGround LeadhURt50 6 feetz Nz SKz T%z -z z Ez F E 50 # 1 “dY z f I& MPBUJOH & #BMBODFE|fi z I H& N7. 2|v|& USOT | H Pshf (Common Mode) Vcm # 9m Acm : VcmV bv 9m Acmf (Differential Mode) Vd
9、m # 9m Adm : W Vdm V bv 9m Admb Vdm_+ Vcm # VoAdmfCMRR(Common Mode Rejection Ratio) : 9m Adm 9m Acm1CMRR =Adm/AcmdB(CMRR) = 20log(Adm/Acm) 1 (CMRR) Acm t ,5 CMRR tKv VB Xsbv sh7 CMRRvzbfsh CMRR? z5 F )(/ / B L bCMRR I 1+350- 350 “A”“B”L VCM= +/- 350V (700 VPP)VDM= +/- 5V (10VPP)CMRR = 200:1CMerror=
10、700 / 200 = 3.5 VPP= 35%CMRR?4CMRRvzB 60dB(1000:1)4 “ q9F CMRRvhlb yH 3 +A-CMRRFreq.f shA!| ha ha#S nbf L 8S n$.33|/bf sh01bv S yN1Stnb TVoutVin+-$ TDIFFAMPVoutVin+-h shsbv Uo CMRR10,000 : 1 DC100 : 1 20 MHz+_h s :z 1 z 50 “dY z :z 1h CMRRz z Sz T%z h VT s h sVOUTh Uo Uo Y 1Amplifier(bv )+_ :z Nz K
11、Sz :z z 1sh CMRRz 50 # 1 (Single-ended)“dY z hUdlf h QG M T| bf kM FB :r (Hall Effect) f T V : % (Fixed Core) 1u 78 (conductor) b s (Split Core) 8 (clipping around)bf 3 E F ( L reflected & R reflected) P DUT rKlbf 4 0 I b h+ h :z ? AC z %1u 78 z Ph 50 x 18 inches50VsourceRsourceUo $ :z z AC zz NLz 40 z DUT (Rreflected 1 to 2 Lreflected 5 H)L reflectedR reflected50H 71 M /50
