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1. 发明授权

EP1647092B1 OPERATIONAL AMPLIFIER WITH CONSTANT OFFSET AND APPARATUS COMPRISING SUCH AN OPERATIONAL AMPLIFIER 失效转让
标题翻译：运算放大器偏移常数和设备，其THIS USED
公开(公告)号：EP1647092B1
公开(公告)日：2010-08-25
申请号：EP04744433.6
申请日：2004-06-30
申请人： NXP B.V.
发明人： MILANESI, Andrea
IPC分类号： H03F3/45
CPC分类号： H03F3/45744 , H03F3/4521 , H03F3/45219 , H03F2200/375 , H03F2203/45616
摘要： Apparatus (80) comprising an input stage (61) with an NMOS transistor doublet having a first differential input for receiving input signals, and a PMOS transistor doublet having a second differential input for receiving input signals. The apparatus (80) further comprises switching means for receiving and selectively directing analog input signals either to the first differential input or to the second differential input. The means are controlled by a switching signal (ϕ,ϕ) in a manner to keep the ratio of the transconductance of the NMOS transistor doublet and the transconductance of the PMOS transistor doublet constant.

2. 发明授权

EP1380102B1 HIGH DUTY CYCLE OFFSET COMPENSATION FOR OPERATIONAL AMPLIFIERS 有权
标题翻译：具有高占空比运算放大器偏移电压补偿
公开(公告)号：EP1380102B1
公开(公告)日：2008-07-16
申请号：EP02718475.3
申请日：2002-04-08
申请人： NXP B.V.
发明人： MILANESI, Andrea
IPC分类号： H03F3/45
CPC分类号： H03F3/45977 , H03F3/45183 , H03F3/45475 , H03F3/45753
摘要： A circuit arrangement comprising an input amplifier stage (31) with two inputs (36, 37) and an output (34) being connectable to an input (35) of an output amplifier stage (32).The circuit furthermore comprises a comparator (33) with a first input (41), a second input (42) and a comparator output (44), a feedback capacitor (43) connected to an offset tuning input (45) of the input amplifier stage (31), and a plurality of switches (S1, S2) that are controllable by switching signals (V1, V2) to allow the circuit to be switched from a first phase to a second phase. During the first phase (1), the output (34) and the input (35) are separated by a first one of the switches (S2) and the two inputs (36, 37) are connected via a second one of the switches (S1). The first input (41) of the comparator (33) is connected to the output (34) of the input amplifier stage (31) and the second input (42) of the comparator (33) is connected to the input (35) of the output amplifier stage (32) such that via the comparator output (44) a charge on the feedback capacitor (43), and hence the voltage at the offset tuning input (45) is altered and an offset of the input amplifier stage (31) is corrected.

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