An adapted SCTA for the readout of the Si strip VErtex LOcator of LHCb.
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1 : Adapted scta for LHCB Vertex locator. An adapted SCTA for the readout of the Si strip VErtex LOcator of LHCb. (CERN) F. Vinci dos Santos (CERN/RIO) E. Sexauer(Heidelberg) IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
2 : Adapted scta for LHCB Vertex locator. Outline: I. Introduction to LHCb and VErtex LOcator (VELO). II. SCTA_VELO requirements. III. Analog signal chain. IV. Readout controller. V. Pipeline and control. VI. Programming interface. IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
3 LHCb B-meson events
4 Geometry of VErtex LOcator. ~ 25 stations stations= r and phi sensor ~ 30mm spacing small overlap separation during injection
5 R measuring sensor 8mm r pitch 25 um ~ thickness 200 um : 1MIP ~ 2.7 fc 2048 strips /sensor capacitance 10~25 pf pitch 18 um 45mm Phi measuring sensor.
6 Mechanical support Vacuum vessel
7 : Adapted scta for LHCB Vertex locator. II. Requirements: SCTA_VELO pipeline delay 4 us. event readout > 1 MHz. deadtimeless (no restriction on trigger-interva). 16 event buffer. minimize spillover (=value 25 ns after peak). readback of configuration bits. SCTA2 ~ 3 us ~ 0.03 MHz. > 3 8 ~ 20% no IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
8 : Adapted scta for LHCB Vertex locator. III. Analog signal chain (scta_velo) Preamplifier & Shaper Pipeline Readout Sample/ hold Multiplexer x4 x184 x32 Pointers bias Encoder/decoder Fifo (16x8) Readout sequencer RST TRG CLK Serial IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
9 : Adapted scta for LHCB Vertex locator. Preamplifier and shaper analog blocks (SCTA3). Preamplifier Shaper stage1 stage2 stage3 x1 gain: 3.6 mv/fc ~ 4 V/V ~ 4 V/V ~1 (>1000 V/V) freq: ~ 1/f ~ 1/f 2 ~f ~ 1/f 2 ~f =57 mv/fc =CR 2 -RC 5 IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
10 Pulse shapes in preamplifier & shaper for -10fC input pulse (scta3). shaper 2-stage : 56 mv/fc shaper 1-stage: 14,7 mv/fc transimpedance : 3.6 mv/fc nanoscconds
11 Frequency response of preampifier and shaper stages. ~f 2 ~f -5 ~f -1 ~f ~f ~f -2 ~f -2
12 : Adapted scta for LHCB Vertex locator. modifications SCTA_VELO : - operate at Vdd= 5V and Vref= 2V. - 40% gain reduction (stage2) : ~30 mv/fc obtain symmetric 20/-20 fc range. IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
13 Gain reduction in SCTA_VELO. (irradiated, slow conditions)
14 Linear signal range in SCTA_VELO. (irradiated, slow conditions) -20 to 20 fc (4fC step) spill-over < 10% 25 ns
15 Comparison 4fC and -4-4fC shaper response. output. (irradiated, slow conditions) 14% undershoot
16 : Adapted scta for LHCB Vertex locator. Pulse peak-voltage storage. Preamplifier & Shaper Pipeline x184-50% load increase on output : not significant in scta3. -worst case simulation ok. IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
17 Comparison of shaper output with extended pipeline. (128 to 184 cells)
18 Peak voltage storage of -20fC pulse (irradiated, slow conditions)
19 Peak voltage storage of 20fC pulse (irradiated, slow conditions)
20 : Adapted scta for LHCB Vertex locator. Stored charge readout and sample/hold. Pipeline Readout C r Sample/ hold C s x184 stray C S/H sample time must < 200ns. (for 1 MHz readout). direct transfer of C s to C S/H too slow. -> 2 phase readout : a. C storage to C r b. C r to C S/H IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
21 : Adapted scta for LHCB Vertex locator. 1MHz readout: phase a: phase b: evt n 1000 ns evt n ns header data header data evt n ns evt n ns plenty of time during header available of event. sample time too short for full settling: (because 50% increased C stray ~ 10* C storage ) -increase transconductance of amplifier, -and reduce C h. -safety : sample time can be programmed 100ns - 500ns IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
22 Charge readout from memory. (phase a) (irradiated, slow conditions)
23 Sample/hold on readout capacitor. (phase b) (irradiated, slow conditions, 100ns gate)
24 Sample/hold on readout capacitor. (phase b) (un-irradiated, typ. conditions, 100 ns gate)
25 Sample/hold on readout capacitor. (phase b) (irradiated, slow conditions, 150 ns gate) -20 fc
26 : Adapted scta for LHCB Vertex locator. Output multiplexer. Sample/ hold Multiplexer x32 - to read Mhz < 1000 ns. -> split 128:1 in 4 parallel 32:1 multiplexers. - splitting reduces settling times. - power dissipation x4. IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
27 Multiplexer: -20 fc after 0 fc channel. (irrad., slow)
28 Multiplexer: 0 fc after -20 fc channel. (irrad., slow)
29 SCTA_VELO: Adapted scta for LHCB Vertex locator. IV. Readout controller. - new design and simplified (no chip pairing). Readout block diagram Clear state-diagram Cstore read Cf Chold hold Mux 32:1 m_out4 m_out3 m_out2 m_out1 vref reset skip cell Unlock Lock Decoder Read_enable Decode_enable Fifo_read le Start E n ab Rclk reset FIFO empty FIFO Fifo_write Fifo_empty Readout controller phase a Fifo_full Trigger phase b & start mux reset l_reset Ful L1_reset ay d_del hol IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
30 : Adapted scta for LHCB Vertex locator. V. Pipeline and controller. -extension of length: 4 us latency -> 160 cells. derandomizer -> 16 cells. special (trigger burst) condition -> 6 cells. dummy cell -> 2 cells. total = 184 cells -programmable latency. -reset independent of readout. -FIFO has been extended to 16 depth. -control signal dsitribution (long lines) verified. IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
31 : Adapted scta for LHCB Vertex locator. VI. I2C interface. -readback of static configuration bits. (SEU check) -need addressing capability on multichip hybrid. -standard protocol. -plan to reuse existing design (TTCrx). -sufficient area available? IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
32 : Adapted scta for LHCB Vertex locator. Conclusion. SCTA_VELO: - no fundamental change to SCTA3 analog signal path, to obtain : 1MHz event readout (16 eventbuffer), deadtimeless, 4us pipeline operation - peripheral enhancements: programmable latency, independent pipeline and readout reset, read back of configuration. IVth international meeting on Frontend electronics for high resolution tracking detectors. Perugia 00
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