- The Strip Hybrid with strip detector and 5
amplifier/pipeline chips (APCs) on it and integrated flexible cable
extension to the repeater. A total of 128 hybrids are required ( 128 installed).
- The Strip Repeater handling two adjacent sectors (16
detectors). It implements:
- 12 subrepeaters with signal updating amplifier, long-line cable
driver and power regulator (8 for r detectors, 4 for
phi detectors)
- a clock booster with line receivers and drivers for high-capacitive
load
A total of 8 repeaters ( 8 installed) and 96
subrepeaters ( 68 installed) are required.
- The OnSiRoC (Online Silicon detector Readout
Controller) includes different functional blocks:
- a pattern sequencer,
- power supplies,
- a 4-channel ADC with buffer memory and online pedestal subtraction.
The BST uses the sequencer only. The other functions are served by
dedicated modules, see below. The sequencer generates 4 clock signals
required for the APC steering. The bit patterns of these clocks differ for
data sampling and readout - the OnSiRoC is therefore controlled by the H1
trigger system.
A total of 1 OnSiRoC ( 1 installed) is
required.
(For best performance the r-strip and phi-strip detectors
may need different control - then another OnSiRoC has to be operated in
parallel.)
- The clocks are fanned out to feed each repeater by means of the
Patch Cards. These provide a previous-in, next-out and 4
cable connectors which have individual signal drivers. Each signal output
features a shaping RC-network on replaceable piggy-backs and a floating
booster power supply; each card allows a phase adjustment of the four
clocks.
(Clock driving has turned out to be somewhat problematic
when the BST grew from 4 to 8 planes in 1998. Namely the shaping network
had to be tuned to find a balance between performance/stability and
BST-caused noise in others detectors.)
A total of 3 Patch Cards ( 3 installed) are
required, one of them being used for the phi detectors.
- All Power Supplies for the repeaters and detectors are located in the
Converter Cards (powering 8 hybrids, 3 supplies each).
The 24 supplies are individually switched by the strip detector slow
control program; furthermore the detectors' depletion voltage is
adjustable.
The Converter Cards include line receivers and level shifters for the
detector output signal to match the PPC-RIO's input requirements.
A total of 9 Converter Cards ( 9 installed) are
required, one of them supplying the phi detectors.
- The detector output signals are transferred to the PPC
RIOs (Power PC based A/D converters with buffer memory and online
data processing). 8 A/D converters, triggered by an OnSiRoC-generated
'convert' pulse, are located in each RIO, sampling the serialised readout
of 16 detectors in parallel. A pedestal subtraction, common mode reduction
and hit finder routine runs on each sampled event.
The PPC RIO crate is linked to the H1 data logging by way of an optical
fibre ring.
A total of 9 PPC Modules ( 9 installed) are
required, one of them serving the phi detectors.
